bing
Set Ascending Direction

25 Items

  1. Extremaratio - RAO C Outdoor - Folding Knife - n690 - Heavy Duty Outdoor

    The RAO C Outdoor is a heavy-duty folding knife designed by Extrema Ratio to ensure maximum strength, reliability and field versatility.

    Derived from the renowned RAO II, this version keeps the solid RAO C structure while adopting features tailored to outdoor tasks. It includes a Böhler N690 stone washed blade, green cerakote aluminum handle, and a dual locking system for extra safety under heavy use.

    Designed for advanced camping, operational bushcraft and demanding fieldwork, it offers an excellent balance of control, portability and consistent performance in natural settings.

    Technical specs:
    Intended use: advanced outdoor - bushcraft - operational camping
    Country of origin: Made in Italy
    Blade: Böhler N690 steel (58 HRC) – high corrosion resistance and edge stability
    Blade finish: stone washed (reduced marks, easy maintenance)
    Blade grind: flat
    Handle: anodized Anticorodal aluminum with cerakote + dual steel frame
    Blade length: 100 mm
    Blade thickness: 4 mm
    Overall length: 225 mm
    Weight: approx. 236 g (Outdoor version)
    Locking system: bar & pin lock with dual safety
    Clip/Sheath: steel clip + Kydex sheath
    Packaging: Extrema Ratio branded box, laser-cut RAO C gadget, outdoor Kydex sheath
    Note: green handle with high-visibility paracord for fast retrieval
    ER-RAO-C-O
    €292.62
    Only 1 left
    Only 1 left
  2. Extrema Ratio - Sethlans S600 Outdoor - Bushcraft Knife / S600 / Fixed Blade

    Designed to face the challenges of the natural environment in professional contexts, the Sethlans S600 Outdoor by Extrema Ratio is one of the most technical and reliable interpretations of the field knife concept. A functional evolution of the original Sethlans, this model features cryo-treated Böhler S600 steel at 64 HRC, ensuring exceptional edge retention and wear resistance in harsh conditions.
     
    The full tang stone washed blade ensures long-term durability and easy maintenance, while the removable green G10 handle offers a secure grip even in wet or muddy conditions. The lightweight modular Kydex sheath supports multiple carry options, meeting the needs of professionals, experienced bushcrafters, and survival experts. Every detail is designed to ensure maximum reliability and usability in the field.
     
    Intended use: Outdoor - bushcraft - professional survival
    Production type: Industrial (Extrema Ratio Outdoor line)
    Country of origin: Italy
    Blade: Böhler S600 - HRC 64 - cryo-treated
    Blade finish: Stone washed
    Handle: Green G10 - removable
    Blade length: 107 mm
    Blade thickness: from 6.3 mm to 4 mm
    Overall length: 224 mm
    Weight: 221 g
    Sheath: Kydex
    Packaging: Standard Extrema Ratio box
    Notes: Includes modular Kydex sheath, Ulticlip, MOLLE-compatible, Malice Clip, and underarm strap
    ER-SET-O
    €319.67
    Only 1 left
    Only 1 left
  3. ExtremaRatio - Col Moschin Paper Knife - letter opener

    COL MOSCHIN Paper Knife is a taglicarte whose outline is faithfully derived from one of the most iconic knives of our production, the Col Moschin model, adopted by the 9th Parachute Assault Regiment "Col Moschin."

    This instrument is part of a larger collection.

    COL MOSCHIN Paper Knife is not only a decorative and evocative accessory, but it also has all the tactical features that are part of Extrema Ratio's DNA.

    It features nylon grips and a sturdy steel blade that echoes the same shape as its big brother.

    COL MOSCHIN Paper Knife is very practical and convenient for the office or home office and is also perfectly suited as an original gift idea.

    Intended Use: Collection/Tactical/Military

    Country of manufacture: Italy
    Blade: stainless steel NOT SHARPENED
    Blade Finish: Burnishing MIL-C-13924
    Handle: nylon
    Blade length: 100mm.
    Blade thickness: 1.5mm.
    Total length: 180mm.
    Weight: 45g.
    Sheath: -
    Packaging: cardboard box with Extrema Ratio logos.
    Notes: -

    ER-COL-PK
    €42.62
    Only 1 left
    Only 1 left
  4. ExtremaRatio - RAO C - N690Co & Aluminum Tactical Grey - folding knife

    Thanks to its structure, RAO C is a tool that despite its small size, manages to guarantee the same qualities of robustness and reliability as its big brother while offering better portability and manageability.

    The locking mechanism on opening is particularly strong as it is assisted by a safety system that turns it into a true fixed blade. The primary safety on the blade is activated by raising and lowering the locking pin. To provide the user with maximum safety in use, a practical and quick secondary safety has been applied, which can be activated simply by moving the locking pin horizontally.

    For the purpose of lightening the steel frames, a template was laser-cut from the profile of the RAO C, which was then used to make a gadget that is delivered with the knife.


    Intended use: hiking/tactical

    Type of production: industrial
    Country of production: Italy
    Blade: stainless steel N690Co 58HRC
    Blade Finish: Burnishing MIL-C-13924
    Handle: anticorodal anodized with hard oxidation
    Blade length: 100mm.
    Blade thickness: 4mm.
    Length closed: 132mm.
    Total length: 225mm.
    Weight: 239g.
    Closure: modified front lock, with push-button aditional safety.
    Notes: keychain gadget, with miniature profile of the knife

    ER-RAOC-TG
    €286.89
    Only 1 left
    Only 1 left
    Rating:
    100%
    5
  5. ExtremaRatio - RAO C - N690Co & Aluminum Black - folding knife

    Thanks to its structure, RAO C is a tool that despite its small size, manages to guarantee the same qualities of robustness and reliability as its big brother while offering better portability and manageability.

    The locking mechanism on opening is particularly strong as it is assisted by a safety system that turns it into a true fixed blade. The primary safety on the blade is activated by raising and lowering the locking pin. To provide the user with maximum safety in use, a practical and quick secondary safety has been applied, which can be activated simply by moving the locking pin horizontally.

    For the purpose of lightening the steel frames, a template was laser-cut from the profile of the RAO C, which was then used to make a gadget that is delivered with the knife.


    Intended use: hiking/tactical

    Type of production: industrial
    Country of production: Italy
    Blade: stainless steel N690Co 58HRC
    Blade Finish: Burnishing MIL-C-13924
    Handle: anticorodal anodized with hard oxidation
    Blade length: 100mm.
    Blade thickness: 4mm.
    Length closed: 132mm.
    Total length: 225mm.
    Weight: 239g.
    Closure: modified front lock, with push-button aditional safety.
    Notes: keychain gadget, with miniature profile of the knife

    ER-RAOC-BK
    €286.89
    Only 1 left
    Only 1 left
  6. ExtremaRatio - Col Moschin Paper Knife - with plexiglass base - paper knife

    COL MOSCHIN Paper Knife is a paper knife whose shape is faithfully derived from one of the most iconic knives of our production, the Col Moschin model, adopted by the 9th Parachute Assault Regiment "Col Moschin".

    This tool is part of a larger collection.

    COL MOSCHIN Paper Knife is not only a decorative and evocative accessory, but also has all the tactical characteristics that are typical of Extrema Ratio's DNA.

    It is equipped with nylon grips and a sturdy steel blade that takes up the same shape as its older brother.

    COL MOSCHIN Paper Knife is very practical and convenient for the office or home studio and is also perfect as an original gift idea.

    Intended use: Collection/Tactical/Military

    Country of production: Italy
    Blade: NOT SHARP stainless steel
    Blade Finish: MIL-C-13924 Bluing
    Handle: nylon
    Blade length: 100mm.
    Blade thickness: 1.5mm.
    Total length: 180mm.
    Weight: 45g.
    Scabbard: -
    Packaging: Cardboard box with Extrema Ratio logos with hand-polished plexiglass base in BLACK color with engraved Extrema Ratio logo
    Note:

    ER-COL-TC
    €57.38
    Only 1 left
    Only 1 left
  7. ExtremaRatio - Sethlans Expeditions - Survival Knife - knife

    Sethlans Expeditions, as well as the Sethlans model from which it derives, is a fixed blade work knife designed to deal with a wide range of situations, but also as a backup blade. The Sethlans Expeditions has been designed in collaboration with Daniele Dal Canto, Master Advanced F.I.S.S. (Federazione italiana survival sportivo e sperimentale) instructor.

    Sethlans Expeditions has a Böhler N690 steel blade heat treated to 58 HRC with MIL-C-13924 burnishing and stone washed surface treatment (Dark Stone finish). The knife comes with desert colored G10 grips that feature the ergonomic design characteristic of Extrema Ratio handles. They can be removed to free the skeleton structure of the knife, allowing maximum lightness with minimum thickness.

    For lovers of extreme customization, the full-tang structure allows the handle to be covered with paracord. The sheath is composed of a very light and minimalist Kydex part. It can be disassembled and can be adapted to both left- and right-handed people. The addition of an optional belt clip allows both vertical and horizontal positioning of the knife and makes the sheath much more versatile than the textile version. It is equipped with a mini pouch with M.O.L.L.E. system containing paracord with flammable filament to be used in case of emergency and/or critical weather conditions and a Firesteel for lighting fires.


    Intended use: Survival / Bushcraft / Utility

    Production type: Industrial
    Country of Production: Italy
    Blade: full tang in stainless steel N690Co 58HRC
    Blade Finish: Burnishing MIL-C-13924 with Dark Stone finish
    Handle: G-10
    Blade length: 107mm.
    Blade thickness: 6.3mm.
    Total length: 224mm.
    Weight: 207g.
    Sheath: Kydex and cordura, M.O.L.L.E. compatible.
    Package: Cardboard box with Extrema Ratio logos.
    Notes: Designed and developed thanks to the collaboration with the instructor Daniele del Canto of F.I.S.S.S. (Federazione Italiana Survival Spotivo e Sperimentale).

    ER-SET-EX
    €359.84
    Rating:
    100%
    5
  8. ExtremaRatio - Sethlans Survival - D2 Exp Dark - Knife

    The "Extrema Ratio Sethlans" is a fixed blade work knife created to face a wide range of situations, suitable for survival, bushcraft, prepping, but also as a backup blade. The Sethlans is available in two versions with two different types of steel.

    Black version that uses D2 steel, heat treated and cryogenically treated at 60 HRC, which has a high resharpening capacity even with makeshift tools. To give greater qualities of hardness and resistance, the blade is coated with the new Teflon-based product "EXP DARK", proposed by Extrema Ratio.

    The knife comes with G10 grips that feature the ergonomic design characteristic of Extrema Ratio handles. They can be removed by releasing the skeletonized structure of the knife, which allows maximum lightness with minimum thickness. For lovers of extreme customization, the full-tang structure allows the handle to be covered with a paracord cord.

    The sheath is composed of a part in very light and minimalist Kydex. It can be disassembled and can be adapted for both left and right handed users. The addition of an optional belt clip allows the knife to be positioned both vertically and horizontally and makes the sheath much more versatile than the textile version. It is also equipped with a mini pouch with M.O.L.L.E. system. containing a double-sided stone for sharpening and a firesteel for lighting fires.

    Intended use: Hiking / Bushcraft

    Country of Production: Italy
    Type: Fixed Blade
    Blade length: 107mm
    Total length: 224mm
    Blade thickness: 6.3mm
    Sharpening: Flat edge
    Weight: 207g
    Blade Material: D2 Steel (60HRC)
    Blade finish: Teflon-based Exp Dark
    Handle: G10
    Notes: designed in collaboration with Daniele Dal Canto, Master Advanced F.I.S.S.S. (Italian Federation of Sports and Experimental Survival).

    ER-SET-BK
    €368.03
    Only 1 left
    Only 1 left
    Rating:
    93%
    4.7
  9. ExtremaRatio - Sethlans Survival - N690 Stone Washed - Knife

    The "Extrema Ratio Sethlans" is a fixed blade work knife created to face a wide range of situations, suitable for survival, bushcraft, prepping, but also as a backup blade. The Sethlans is available in two versions with two different types of steel.

    Stone Washed version that uses Böhler N690 heat treated at 58 HRC, chosen for the reliability it has shown over the last 20 years due to its resistance to oxidation and durability of the wire.

    The knife comes with G10 grips that feature the ergonomic design characteristic of Extrema Ratio handles. They can be removed by releasing the skeletonized structure of the knife, which allows maximum lightness with minimum thickness. For lovers of extreme customization, the full-tang structure allows the handle to be covered with a paracord cord.

    The sheath is composed of a part in very light and minimalist Kydex. It can be disassembled and can be adapted for both left and right handed users. The addition of an optional belt clip allows the knife to be positioned both vertically and horizontally and makes the sheath much more versatile than the textile version. It is also equipped with a mini pouch with M.O.L.L.E. system. containing a double-sided stone for sharpening and a firesteel for lighting fires.

    Intended use: Hiking / Bushcraft

    Country of Production: Italy
    Type: Fixed Blade
    Use: Survival, bushcraft, prepping
    Blade length: 107mm
    Total length: 224mm
    Blade thickness: 6.3mm
    Sharpening: Flat edge
    Weight: 207 g
    Blade Material: Böhler N690Co Steel (58HRC)
    Blade Finish: Stone Washed
    Handle: G10
    Notes: designed in collaboration with Daniele Dal Canto, Master Advanced F.I.S.S.S. (Italian Federation of Sports and Experimental Survival).

    ER-SET-SW
    €368.03
    Only 1 left
    Only 1 left
    Rating:
    91%
    4.6
  10. ExtremaRatio - Resolza 10 - Black - pattada knife

    RESOLZA, a term of ancient origin, is today one of the most famous traditional knives of our country. The name suggests the razor by chance.

    It was born in Sardinia centuries ago and has accompanied its inhabitants until today in the daily work of a peasant and pastoral life, following them even when its men were called to war. The chronicles of the Sassari Brigade during the First World War cite this knife among its soldiers' equipment.

    We wanted to make a tribute by revisiting it according to our canons, without wanting to hurt any of the prestigious Sardinian artisans who still today pass on the tradition and wisdom of their ancestors. The dimensions and proportions are the original ones of a 10 cm blade, but the materials and technologies are those of our production. The handle revised in our style, the blade most faithful to tradition. In addition to the original, it has the blade lock open.

     

    Intended use: sports

    Type of production: industrial
    Country of production: Italy
    Blade: stainless steel N690Co 58HRC
    Handle: Anticorodal
    Blade length: 100mm.
    Blade thickness: 3mm.
    Total length: 220mm.
    Weight: 65g.
    Closure: Liner Lock
    Clip: -
    Sheath: -
    Notes: blade with MIL-C 13924 burnishing

    ER-RE10-BK
    €172.13
    Only 1 left
    Only 1 left
    Rating:
    87%
    4.4
  11. ExtremaRatio - Resolza 10 - Stone Washed - pattada knife

    RESOLZA, a term of ancient origin, is today one of the most famous traditional knives of our country. The name suggests the razor by chance.

    It was born in Sardinia centuries ago and has accompanied its inhabitants until today in the daily work of a peasant and pastoral life, following them even when its men were called to war. The chronicles of the Sassari Brigade during the First World War cite this knife among its soldiers' equipment.

    We wanted to make a tribute by revisiting it according to our canons, without wanting to hurt any of the prestigious Sardinian artisans who still today pass on the tradition and wisdom of their ancestors. The dimensions and proportions are the original ones of a 10 cm blade, but the materials and technologies are those of our production. The handle revised in our style, the blade most faithful to tradition. In addition to the original, it has the blade lock open.

     

    Intended use: sports

    Type of production: industrial
    Country of production: Italy
    Blade: stainless steel N690Co 58HRC
    Handle: Anticorodal
    Blade length: 100mm.
    Blade thickness: 3mm.
    Total length: 220mm.
    Weight: 65g.
    Closure: Liner Lock
    Clip: -
    Sheath: -
    Notes: blade with stonewashed treatment

    ER-RE10-SW
    €168.03
    Only 1 left
    Only 1 left
    Rating:
    95%
    4.8
  12. ExtremaRatio - BD2 Lucky Desert knife - knife

    Intended use: Tactical

    Type of production: Industrial
    Lama production: Italy
    Blade: N690Co 58HRC stainless steel
    Lama treatment: Satin
    Handle: Anticorodal
    Blade length: 95mm.
    Blade thickness: 3mm.
    Length closed: 128mm.
    Total length: 224mm.
    Thick when closed: 17mm.
    Balancing: -
    Weight: 104g.
    Closure: Liner Lock
    Clip: removable in stainless steel
    Sheath: -
    Packaging: cardboard box with Extrema Ratio logos
    Note: -

    ER-BD2-DE
    €180.33
    Only 1 left
    Only 1 left
    Rating:
    100%
    5
  13. ExtremaRatio - Panthera Black - folding knife

    Panthera is a new folding that retains all the features of the T-Razor, from which it draws inspiration, with the difference that the dorsal part of the blade goes down towards the tip, like the wharncliff blades. The knife presents the new Razor opening high speed opening system.

    Intended use: Sports / Tactical

    Type of production: industrial
    Blade: stainless steel N690Co 58HRC
    Country of production: Italy
    Handle: Anticorodal Anodised aluminum
    Blade length: 100mm.
    Blade thickness: 3mm.
    Length closed: 165mm.
    Total length: 247mm.
    Weight: 130g.
    Closure: Liner Lock
    Clip: absent
    Sheath: absent
    Note: -

    ER-PAN-BL
    €191.80
    Only 1 left
    Only 1 left
  14. ExtremaRatio - RAO C Folding Knife - Tactical Grey - PRIVATE COLLECTION - knife

    PREVIOUSLY PURCHASED KNIFE, FROM A PRIVATE COLLECTION
    * Origin: Acquired from a private seller, previously purchased
    * Condition: Overall in excellent condition; opened and closed only a handful of times; never used for cutting
    * Available on the market: Available
    * Sharpening: Factory-sharpened
    * Marks on blade: None
    * Marks on handle: Minor marks on the handle’s anodized finish, near the release pins
    * Box: Present and complete
    * Sheath: /
    * Manuals, Certificates, and Warranties: Present
    * Inspected and Certified by our in-house laboratory

     

    The Extrema Ratio RAO C is a compact folding knife derived from the iconic RAO II.

    Thanks to its design, the RAO C is a tool that, despite its small size, manages to guarantee the same robustness and reliability as its larger counterpart while offering improved portability and handling.

    The handle consists of two finely crafted anodized aluminum scales, to which Extrema Ratio applies a hard-anodizing treatment, making the handle more resistant to wear and corrosion.

    Two steel frames help increase the handle’s sturdiness to withstand the most demanding uses.

    The opening lock mechanism is particularly durable, as it is supplemented by a safety system that transforms it into a true fixed blade. The primary safety on the blade is activated by lifting and lowering the locking pin. To ensure maximum safety for the user, a practical and quick secondary safety has been added, which can be activated simply by moving the locking pin horizontally.

    The reversible clip is designed to allow for concealed carry in a pocket, making the knife invisible from the outside.

    The blade is made of Böhler N690 steel, hardened to 58 HRC, with the classic Extrema Ratio MIL-C-13924 black finish.

    To lighten the steel frames, a laser-cut template based on the RAO C profile was created, which was then used to make a gadget included with the knife.

     

    Intended use: Hiking / Tactical

    Production type: industrial
    Country of manufacture: Italy
    Blade: N690Co stainless steel 58HRC
    Blade finish: MIL-C-13924 burnishing
    Handle: hard-anodized anticorodal
    Blade length: 100mm.
    Blade thickness: 4mm.
    Closed length: 132mm.
    Overall length: 225mm.
    Weight: 239g.
    Closure: Modified front lock, with additional push-button safety
    Notes: Keychain gadget, featuring a miniature profile of the knife—a previously purchased knife from a private collection

    ER-RAOC-TG-CP
    €0.00
    Only 0 left
    Only 0 left
    Out of stock
  15. ExtremaRatio - Sethlans Survival Knife - D2 Exp Dark - USED / PRIVATE COLLECTION - Knife

    KNIFE WITHDRAWN FROM PRIVATE COLLECTION
    * Origin: Withdrawn from a private collection, previously purchased and used
    * Condition: Overall in excellent condition, with slight superficial signs of wear from use that do not compromise its functionality in any way. The sharpening stone and steel included have also been used, with minimal signs of cosmetic abrasion.
    * Available on the market: Available on the market
    * Sharpening: Factory sharpened, with minor “field” sharpening with the included ceramic stone
    * Marks on blade: Minor surface wear from use
    * Marks on handle: None
    * Box: Present
    * Sheath: Present
    * Manuals, Certificates, and Warranties: Present
    * Checked and certified by our in-house laboratory

     

    The “Extrema Ratio Sethlans” is a fixed blade utility knife designed to handle a wide range of situations, suitable for survival, bushcraft, prepping, but also as a backup blade. The Sethlans is available in two versions with two different types of steel.

    The Black version uses D2 steel, heat and cryogenically treated to 60 HRC, which has a high regrindability even with makeshift tools. To give greater hardness and resistance, the blade is coated with the new Teflon-based product “EXP DARK” offered by Extrema Ratio.

    The knife comes with G10 scales featuring the ergonomic design characteristic of Extrema Ratio handles. They can be removed to reveal the skeletonized structure of the knife, which allows for maximum lightness with minimum thickness. For lovers of extreme customization, the full-tang structure allows the handle to be coated with paracord.

    The sheath is made of a lightweight, minimalist Kydex. It can be disassembled and adapted for both left- and right-handed users. The addition of an optional belt clip allows the knife to be positioned either vertically or horizontally and makes the sheath much more versatile than the textile version. It also comes with a mini pouch with a M.O.L.L.E. system containing a double-sided sharpening stone and a firesteel for lighting fires.

     

    Intended use: Survival, bushcraft, prepping

    Type: Fixed blade
    Blade length: 107mm
    Total length: 224mm
    Blade thickness: 6.3mm
    Sharpening: Flat edge
    Weight: 207g
    Blade material: D2 steel (60HRC)
    Blade finish: EXP DARK
    Handle: G10
    Notes: designed in collaboration with Daniele Dal Canto, Master Advanced F.I.S.S.S. instructor (Italian Federation of Survival Sports and Experiments).

    ER-SET-BK-CP
    €0.00
    Only 0 left
    Only 0 left
    Out of stock
  16. ExtremaRatio - BD2 R Satin knife - PRIVATE COLLECTION - knife

    KNIFE RETIRED FROM PRIVATE COLLECTION
    * Type: Previously Purchased
    * Condition: In very good condition
    * NO longer available on the market
    * Sharpening: Factory
    * Marks on blade: None
    * Marks on handle: Very small marks
    * Box: Present
    * Sheath: -
    * Manuals, Certificates and Guarantees: ER
    * Checked and certified by our internal laboratory

    Medium folding bag from the BD series. It is produced with an aluminum handle which enhances its characteristics of resistance and lightness, also thanks to the steel frame. The model maintains all the features of the BD2 updated with the new High Speed ​​Razor Opening system.

    Intended use: Sports / EDC

    Type of production: Industrial
    Blade production: Italy
    Blade: N690Co 58HRC stainless steel
    Blade treatment: Satin
    Handle: Anticorodal
    Blade length: 95mm.
    Blade thickness: 3mm.
    Closed length: 128mm.
    Total length: 224mm.
    Closed thickness: 17mm.
    Weight: 105g.
    Closure: Liner Lock
    Clip: removable in stainless steel
    Packaging: cardboard box with Extrema Ratio logos
    Note: -

    AP-ER-BD2R
    €0.00
    Only 0 left
    Only 0 left
    Out of stock
  17. ExtremaRatio - T4000 C Satin - knife

    Intended Use: Sporting / Backup

    Production type: Industrial
    Country of Production: Italy
    Blade: Bohler N690Co stainless steel at 58HRC
    Blade Finish: Satin finish
    Handle: Forprene
    Blade length: 104mm.
    Blade thickness: 4mm.
    Total length: 208mm.
    Weight: 196g.
    Sheath: Nylon
    Packaging: Cardboard box with Extrema Ratio logos.

    ER-T4C-SA
    €0.00
    Only 0 left
    Only 0 left
    Rating:
    100%
    5
    Out of stock
  18. ExtremaRatio - E.C.M. Cobra - ECM Einsatzkommando - Knife

    The Extreme Ratio E.C.M. (Einsatzkommando Cobra Messer) is a fixed blade multipurpose knife, designed for operational uses for the famous Einsatzkommando "Cobra" special unit of the Austrian police, whose logo is laser engraved on the heel of the blade. The Extreme Ratio E.C.M. it combines the characteristics of a practical tool and those of a reliable weapon, in a compact configuration with a total weight of 240g.

    The blade is made of Böhler N690 steel, hardened to 58 HRC and is 116 mm long, 5 mm thick and equipped with a flat edge. The profile of the blade is of the modified spear point type, with a false counter-thread ¾ in length on the back and a lower guard to protect the hand during use.

    Both the guard and the knob have holes to facilitate the attachment of the knife to various tools or for the passage of laces. The blade has a Carbon-based DLC (Diamond-Like Carbon) surface coating making it hyper-resistant to abrasion and chemical aggression.

    Given the heavy use of the tool, for the handle, instead of the usual Forprene, the more performing high-strength G10 is used.

    It is fixed to the FULL TANG profile by two through screws and maintains all the known ergonomic characteristics of the Extrema Ratio handles. Being a knife designed for professional use, great importance was given to ease of port, accessibility and rapid extraction.

    The polymer sheath is versatile and can be carried on a service belt or mounted on M.O.L.L.E. of tactical vests, backpacks or other equipment.

     

    Intended use: Tactical / Military

    Type of production: Industrial
    Country of production: Italy
    Blade: Bohler N690Co stainless steel at 58HRC
    Blade treatment: DLC (Diamond Like Coating)
    Handle: G10
    Blade length: 106mm.
    Blade thickness: 5mm.
    Total length: 233mm.
    Weight: 240g.
    Sheath: Synthetic, polymer, MOLLE compatible
    Packaging: Cardboard box with Extrema Ratio logos

    ER-ECM
    €0.00
    Only -1 left
    Only -1 left
    Out of stock
  19. ExtremaRatio - BD2 Lucky Black knife - knife

    Intended use: Tactical

    Type of production: Industrial
    Lama production: Italy
    Blade: N690Co 58HRC stainless steel
    Blade Treatment: MIL-C-13924 Burnishing
    Handle: Anticorodal
    Blade length: 95mm.
    Blade thickness: 3mm.
    Length closed: 128mm.
    Total length: 224mm.
    Thick when closed: 17mm.
    Balancing: -
    Weight: 104g.
    Closure: Liner Lock
    Clip: removable in stainless steel
    Sheath: -
    Packaging: cardboard box with Extrema Ratio logos
    Note: -

    ER-BD2-BK
    €188.52
    Only 0 left
    Only 0 left
    Rating:
    80%
    4
    Out of stock
  20. ExtremaRatio - Panthera Satin - folding knife

    Panthera is a new folding that retains all the features of the T-Razor, from which it draws inspiration, with the difference that the dorsal part of the blade goes down towards the tip, like the wharncliff blades. The knife presents the new Razor opening high speed opening system.

    Intended use: Sports / Tactical

    Type of production: industrial
    Blade: stainless steel N690Co 58HRC
    Country of production: Italy
    Handle: Anticorodal Anodised aluminum
    Blade length: 100mm.
    Blade thickness: 3mm.
    Length closed: 165mm.
    Total length: 247mm.
    Weight: 130g.
    Closure: Liner Lock
    Clip: absent
    Sheath: absent
    Note: -

    ER-PAN-SA
    €0.00
    Only 0 left
    Only 0 left
    Out of stock
  21. ExtremaRatio - Scout Satin - knife

    Intended use: Hiking / Backup

    Type of production: Industrial
    Country of production: Italy
    Blade: Stainless Steel Bohler N690Co at 58HRC
    Blade Treatment: Satin
    Handle: Forprene
    Blade Length: 103mm.
    Blade thickness: 5mm.
    Overall length: 217mm.
    Weight: 141g.
    Sheath: In Nylon, compatible with M.O.L.L.E.
    Packing: Cardboard box with Extrema Ratio logos

    ER-SCO-SW
    €145.90
    Only 0 left
    Only 0 left
    Rating:
    100%
    5
    Out of stock
  22. ExtremaRatio - Scout Black - knife

    Intended use: Hiking / Backup

    Type of production: Industrial
    Country of production: Italy
    Blade: Stainless Steel Bohler N690Co at 58HRC
    Blade Treatment: Brush MIL-C-13924
    Handle: Forprene
    Blade Length: 103mm.
    Blade thickness: 5mm.
    Overall length: 217mm.
    Weight: 141g.
    Sheath: In Nylon, compatible with M.O.L.L.E.
    Packing: Cardboard box with Extrema Ratio logos

    ER-SCO-BK
    €167.21
    Only 0 left
    Only 0 left
    Out of stock
  23. ExtremaRatio - T4000 C Testudo - knife

    With the T4000 C continues the purest series so Extrema Ratio, for lovers of the profile of Japanese blades that do not want to give up the accessories typically tactical as sheath and handle.

    Intended use: Tactical / Backup

    Type of production: Industrial
    Production Country: Italy
    Blade: stainless steel Bohler N690Co to 58HRC
    Treatment blade: Browning MIL-C-13924
    Handle: Forprene
    Blade length: 104mm.
    Blade thickness: 4mm.
    Length closed: -
    Overall length: 208mm.
    Thick when closed: -
    Balancing: -
    Weight: 196g.
    Closing: -
    Clip: -
    Sheath: Nylon
    Packaging: Cardboard box with logos Extrema Ratio
    Notes: -

    12381
    €0.00
    Only 0 left
    Only 0 left
    Rating:
    93%
    4.7
    Out of stock
  24. ExtremaRatio - T-Razor - knife

    Until the early years of the '900 was commonly carry in your pocket a boxcutter by utility but, with a succession of cases of "misuse" of these objects, the law imposed the cutting or cutting-off of the tip of the blade to limit the harmfulness . Someone thought it well to take full advantage of the cutting edge of a blade typically already checked, taking as a pocket knife a straight razor, which became for a certain period of time a feared defensive tool.

    Intended Use: Sports

    Type of production: Industrial
    Blade: stainless steel N690Co 58HRC
    Production Lama: Italy
    Handle: Anticorodal
    Blade length: 100mm.
    Blade Thickness: 3mm.
    Length closed: -mm.
    Overall length: 243mm.
    Balancing: -
    Weight: 130g.
    Lock: Liner Lock
    Clip: -
    Sheath: -
    Notes: -

    ER-RAZ-SA
    €0.00
    Only 0 left
    Only 0 left
    Rating:
    93%
    4.7
    Out of stock
  25. ExtremaRatio - T-Razor Black - Folding Knife

    Until the early years of the '900 was commonly carry in your pocket a boxcutter by utility but, with a succession of cases of "misuse" of these objects, the law imposed the cutting or cutting-off of the tip of the blade to limit the harmfulness . Someone thought it well to take full advantage of the cutting edge of a blade typically already checked, taking as a pocket knife a straight razor, which became for a certain period of time a feared defensive tool.

    Intended Use: Sports

    Type of production: Industrial
    Blade: stainless steel N690Co 58HRC
    Country of production: Italy
    Handle: Anticorodal
    Blade length: 100mm.
    Blade Thickness: 3mm.
    Overall length: 243mm.
    Weight: 130g.
    Lock: Liner Lock
    Clip: -
    Notes: -

    ER-RAZ-BK
    €0.00
    Only 0 left
    Only 0 left
    Out of stock
Set Ascending Direction

25 Items

Extrema Ratio — Made in Italy Professional Tactical Excellence

Extrema Ratio stands as a global benchmark in tactical and military cutlery. Based in Prato, Italy, the company designs cutting tools built for real-world application: serving Military Entities, Law Enforcement, Special Forces, Counter-Terrorism units, and Rescue teams. Every model is created to ensure reliability, robustness, and performance even in the most critical conditions.

Military DNA

Official supplier to the Armed Forces (NATO Code AD856). Iconic models such as Col Moschin, Fulcrum, ADRA, and KH are developed based on specific operational requirements from elite Italian and international units.

⚙️ Technology + Craftsmanship

A hybrid production process: industrial precision for perfect tolerances, combined with manual finishing and sharpening performed by expert craftsmen. Every single knife is individually tested and inspected.

Advanced Materials

Beyond the renowned Böhler N690 treated to 58HRC, Extrema Ratio employs sintered steels like M390 and Nitrogen-based alloys for maximum corrosion resistance. Forprene handles are designed for total grip in any condition.

Why buy Extrema Ratio from Coltelleria Collini?

We have been Historic Official Dealers for over 25 years. Our direct collaboration with the company allows us to offer real value:

  • Exclusive Limited Editions created with Extrema Ratio, including special versions in Japanese Takefu laminated steel.
  • Constant availability of the most requested models and new releases updated in real-time.
  • 100% original products, with official warranty and dedicated post-sales support.
  • Professional custom laser engraving service.

Extrema Ratio FAQ

What steel does Extrema Ratio use?

Primarily Böhler N690Co. Premium models employ M390 (maximum edge retention) and Nitrogen steels. Collini limited editions also feature precious Japanese laminates.

Are Extrema Ratio knives truly Made in Italy?

Yes. Production is entirely carried out in Prato, Italy, with total control over materials, treatments, and finishes.

What does NATO Code AD856 mean?

It certifies Extrema Ratio as an official supplier for NATO Armed Forces. It is a standard guaranteeing quality, traceability, and military reliability.