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Extrema Ratio
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ExtremaRatio - Ant Black Knife - N690 - Folding Knife
The Ant is the most compact among Extrema Ratio's folding knives. Despite its small size, this model features an extremely sturdy, durable, and reliable structure.
The handle is made of two different elements: the cheek piece crafted from anodized anticorodal aluminum and the hardened steel frame which also serves as the blade lock (Frame Lock System). This mechanism involves a part of the frame bending inward to firmly secure the blade in the open position, enhancing the user's safety during the knife's use.
The tang features a hole for the insertion of a lanyard, and on the right side of the handle, there is a steel clip that allows for concealed carry in the pocket.
The Ant Black version utilizes Böhler N690, hardened to 58 HRC for the best balance between edge retention and toughness, a type of steel used by Extrema Ratio for most of its knives.
The blade is sheep foot-shaped and has a small hole on the top part to facilitate opening. Its particular structure, with a straight edge, allows the user to comfortably rest their fingers on the back of the knife and use it with ease.
Type of production: industrial
Blade: in stainless steel N690 58 HRC
Blade production: Italy
Handle: anodized anticorodal aluminum and steel
Blade length: 70mm.
Blade thickness: 2.2mm.
Closed length: 55mm.
Total length: 127mm.
Balancing: -
Weight: 42g.
Closure: Frame Lock
Clip: removable stainless steel
Sheath: -
Notes:ER-ANT-B-B€104.92Only 2 leftOnly 2 left
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ExtremaRatio - Ant Black Stone Washed Knife - M390 - Folding Knife
The Ant is the most compact among Extrema Ratio's folding knives. Despite its small size, this model features an extremely sturdy, durable, and reliable structure.
The handle is made of two different elements: the cheek piece crafted from anodized anticorodal aluminum and the hardened steel frame which also serves as the blade lock (Frame Lock System). This mechanism involves a part of the frame bending inward to firmly secure the blade in the open position, enhancing the user's safety during the knife's use.
The tang features a hole for the insertion of a lanyard, and on the right side of the handle, there is a steel clip that allows for concealed carry in the pocket.
The Ant is available in 4 versions with two different types of steel, both provided by Böhler, an Austrian company with which Extrema Ratio has been collaborating for over 20 years, using its highly esteemed materials for the production of its blades.
For the Stone Washed M390 version, Extrema Ratio uses Böhler M390 steel, thermally treated to 61 HRC, which, thanks to a powder metallurgy production process, ensures cutting effectiveness, wear resistance, and oxidation resistance over time.
The blade is sheep foot-shaped and has a small hole on the top part to facilitate opening. Its particular structure, with a straight edge, allows the user to comfortably rest their fingers on the back of the knife and use it with ease.
Type of production: industrial
Blade: in stainless steel M390 61HRC
Blade production: Italy
Handle: anodized anticorodal aluminum and steel
Blade length: 70mm.
Blade thickness: 2.2mm.
Closed length: 55mm.
Total length: 127mm.
Balancing: -
Weight: 42g.
Closure: Frame Lock
Clip: removable stainless steel
Sheath: -
Notes:ER-ANT-B-M€108.20Only 1 leftOnly 1 left -
ExtremaRatio - Ferrum Rescue multi tool - Black - knife
Ferrum Rescue is a tool designed for rescue operations, developed in collaboration with my friend Andrea Micheli, military and law enforcement expert, journalist and shooting instructor. Made with a very compact handle, this rescue tool is equipped with 3 blades, each of which has a specific function:
The first and main blade has a thickness of 3 millimeters and is designed to be used for more demanding purposes and to protect the cutting edge of the other two from premature wear. The teeth allow it to cut larger ropes or textile materials, the remaining smooth part has the classic function of a knife. The second blade is a scalpel, which can be used for extremely precise cuts and for emergency first aid interventions. The third blade, on the back of the first, is the smallest of the 3, it has the function of cutting lines, capable of cutting paracord and aramid material.
The interaction of the main blade with the scalpel allows the operator to make a quick emergency cut to free any injured person from his or her clothing.
The line cutter blade and the scalpel are both interchangeable.
Ferrum Rescue has a slim and compact shape, the two anodized anticorodal aluminum grips make up a light, slender and at the same time very resistant handle. It can be housed in a breast pocket, in small flashlight holsters or inside a single loop of the M.O.L.L.E. system. On the back there is also a hard metal glass breaker.
Equipped with a flipper assisted opening system, the blade rotates on ball bearings which allow a smooth and uncertain movement of the blade. This mechanism allows the operator to open the blade quickly and easily, even with just one hand. The locking system adopted is the well-tested liner lock. The reversible clip is positioned on the back.
The reversible clip is positioned on the back.
Intended use: Tactical / EDC
Type of production: Industrial
Country of production: Italy
Blade: N690Co 58HRC stainless steel
Blade finish: Satin
Handle: Rough Anticorodal
Blade length: 56mm.
Blade thickness: 3mm.
Closed length: 90mm.
Total length: 170mm. (18mm. INCLUDING SCALPEL BLADE)
Weight: 85g.
Closure: Liner Lock
Clip: Removable and reversible, in stainless steel
Packaging: Cardboard box with Extrema Ratio logos
Note: -ER-FE-RB€237.70Only 2 leftOnly 2 left -
ExtremaRatio - BF0 R CD HCS- Stone Washed - knife
It is a small basic folder, produced with a technopolymer handle that enhances its resistance and lightness, thanks also to the steel frame. The blade locking mechanism is the tried and tested LINER-LOCK. The model keeps all the features of the BF0 updated with the new High Speed Razor Opening opening system. Available in the following versions: BF0 R CD Desert with stone washed blade and HCS and BF0 R CD Stone Washed with stone washed blade and black grip.
Type of production: industrial
Blade: stainless steel N690Co 58HRC
Country of production: Italy
Handle: Nylon with stainless steel folders
Blade length: 55mm.
Blade thickness: 2.5mm.
Length closed: 85mm.
Total length: 140mm.
Weight: 53g.
Closure: Liner Lock
Clip: reversible and removable, in stainless steelER-BF0R-HCS€79.51Only 1 leftOnly 1 left -
ExtremaRatio - N.K.3 Karambit Desert Warfare - Neck Knife - NK3K - knife
NK3 is a small knife that extends the family of the neck knives Extrema Ratio.
It differs from the models NK1 and NK2 for the largest size of the blade-type "long" 70mm. The ergonomic grip is designed so as to prevent accidental cuts during withdrawal from the scabbard.
On the back it is formed a drain for the positioning of the thumb or index depending on use. The structure enables both use for work or cutting very effective for small precision work.
The Kydex sheath is a quick release and is supplied to the port of paracord knife in his neck.
intended use: Neck Knife
type of production: Industrial
production country: Italy
Blade: stainless steel N690Co 58 / 60HRC
Blade treatment: Desert Warfare
manicatura: stainless steel N690Co 58 / 60HRC
blade length: 70mm.
blade thickness: 6.3mm.
total length: 172mm.
Weight: 95g.
Sheath: Kydex, neck
Package: Cardboard box with logos Extrema Ratio
Notes: possibility of using the sheath with MOLLE systems or Tek-Lok (not included in the package)12636€163.11Only 98 leftOnly 98 left -
ExtremaRatio - N.K.3 Karambit Stone Washed - Neck Knife - NK3K - knife
NK3 is a small knife that extends the family of the neck knives Extrema Ratio.
It differs from the models NK1 and NK2 for the largest size of the blade-type "long" 70mm. The ergonomic grip is designed so as to prevent accidental cuts during withdrawal from the scabbard.
On the back it is formed a drain for the positioning of the thumb or index depending on use. The structure enables both use for work or cutting very effective for small precision work.
The Kydex sheath is a quick release and is supplied to the port of paracord knife in his neck.
intended use: Neck Knife
type of production: Industrial
production country: Italy
Blade: stainless steel N690Co 58 / 60HRC
Blade treatment: Stone Washed
manicatura: stainless steel N690Co 58 / 60HRC
blade length: 70mm.
blade thickness: 6.3mm.
total length: 172mm.
Weight: 95g.
Sheath: Kydex, neck
Package: Cardboard box with logos Extrema Ratio
Notes: possibility of using the sheath with MOLLE systems or Tek-Lok (not included in the package)ER-NK3K-SW€152.46Only 1 leftOnly 1 left -
ExtremaRatio - N.K.3 Karambit Black - Neck Knife - NK3K - knife
NK3 is a small knife that extends the family of the neck knives Extrema Ratio.
It differs from the models NK1 and NK2 for the largest size of the blade-type "long" 70mm. The ergonomic grip is designed so as to prevent accidental cuts during withdrawal from the scabbard.
On the back it is formed a drain for the positioning of the thumb or index depending on use. The structure enables both use for work or cutting very effective for small precision work.
The Kydex sheath is a quick release and is supplied to the port of paracord knife in his neck.
intended use: Neck Knife
type of production: Industrial
production country: Italy
Blade: stainless steel N690Co 58 / 60HRC
Blade treatment: Black PVD cat. MIL-C-13924
manicatura: stainless steel N690Co 58 / 60HRC
blade length: 70mm.
blade thickness: 6.3mm.
total length: 172mm.
Weight: 95g.
Sheath: Kydex, neck
Package: Cardboard box with logos Extrema Ratio
Notes: possibility of using the sheath with MOLLE systems or Tek-Lok (not included in the package)ER-NK3K-BK€159.02Only 1 leftOnly 1 left -
ExtremaRatio - N.K.3 Desert Warfare - Neck Knife - NK3 - knife
NK3 is a small knife that extends the family of the neck knives Extrema Ratio.
It differs from the models NK1 and NK2 for the largest size of the blade-type "long" 70mm. The ergonomic grip is designed so as to prevent accidental cuts during withdrawal from the scabbard.
On the back it is formed a drain for the positioning of the thumb or index depending on use. The structure enables both use for work or cutting very effective for small precision work.
The Kydex sheath is a quick release and is supplied to the port of paracord knife in his neck.
intended use: Neck Knife
type of production: Industrial
production country: Italy
Blade: stainless steel N690Co 58 / 60HRC
Blade treatment: Black PVD cat. MIL-C-13924
manicatura: stainless steel N690Co 58 / 60HRC
blade length: 70mm.
blade thickness: 6.3mm.
total length: 153mm.
Weight: 82g.
Sheath: Kydex, neck
Package: Cardboard box with logos Extrema Ratio
Notes: possibility of using the sheath with MOLLE systems or Tek-Lok (not included in the package)ER-NK3-DW€146.72Only 1 leftOnly 1 left -
ExtremaRatio - N.K.3 Black - Neck Knife - NK3 - knife
NK3 is a small knife that extends the family of the neck knives Extrema Ratio.
It differs from the models NK1 and NK2 for the largest size of the blade-type "long" 70mm. The ergonomic grip is designed so as to prevent accidental cuts during withdrawal from the scabbard.
On the back it is formed a drain for the positioning of the thumb or index depending on use. The structure enables both use for work or cutting very effective for small precision work.
The Kydex sheath is a quick release and is supplied to the port of paracord knife in his neck.
intended use: Neck Knife
type of production: Industrial
production country: Italy
Blade: stainless steel N690Co 58 / 60HRC
Blade treatment: Black PVD cat. MIL-C-13924
manicatura: stainless steel N690Co 58 / 60HRC
blade length: 70mm.
blade thickness: 6.3mm.
total length: 153mm.
Weight: 82g.
Sheath: Kydex, neck
Package: Cardboard box with logos Extrema Ratio
Notes: possibility of using the sheath with MOLLE systems or Tek-Lok (not included in the package)ER-NK3-BK€140.16Only 1 leftOnly 1 left -
ExtremaRatio - N.K.2 Black - Neck Knife - NK2
NK2 is a small knife that extends the family of the Extrema Ratio neck knives.
It differs from the model NK1 for blade tip tanto styled and for the increased thickness. The ergonomic grip is designed so as to prevent accidental cuts during withdrawal from the scabbard.
On the back it is formed a drain for the positioning of the thumb or forefinger depending on use. The structure enables both use for very effective cutting work or for small precision work.The quick release Kydex sheath is supplied with paracord for carrying on the neck.
Intended use: Neck Knife
Type of production: Industrial
Production country: Italy
Blade: stainless steel N690Co 58 / 60HRC
Blade treatment: Black PVD cat. MIL-C-13924
Handle: stainless steel N690Co 58 / 60HRC
Blade length: 50mm.
Blade thickness: 6.3mm.
Total length: 129mm.
Weight: 69g.
Sheath: Kydex, neck
Package: Cardboard box with Extrema Ratio logo
Notes: possibility of using the sheath with MOLLE systems or Tek-Lok (not included in the package)ER-NK2-BK€122.95Only 1 leftOnly 1 left -
ExtremaRatio - N.K.2 Stone Washed - Neck Knife - NK2
NK2 is a small knife that extends the family of the neck knives Extrema Ratio.
It differs from the model NK1 for blade-type "time" and for the increased thickness. The ergonomic grip is designed so as to prevent accidental cuts during withdrawal from the scabbard.
On the back it is formed a drain for the positioning of the thumb or index depending on use. The structure enables both use for work or cutting very effective for small precision work.The Kydex sheath is a quick release and is supplied to the port of paracord knife in his neck.
intended use: Neck Knife
type of production: Industrial
production country: Italy
Blade: stainless steel N690Co 58 / 60HRC
Blade treatment: Stone Washed
manicatura: stainless steel N690Co 58 / 60HRC
blade length: 50mm.
blade thickness: 6.3mm.
total length: 129mm.
Weight: 69g.
Sheath: Kydex, neck
Package: Cardboard box with logos Extrema Ratio
Notes: possibility of using the sheath with MOLLE systems or Tek-Lok (not included in the package)ER-NK2-SW€110.66Only 1 leftOnly 1 left -
ExtremaRatio - Ant Rescue Red Stone Washed Knife - M390 - Folding Knife
The Ant is the most compact among Extrema Ratio's folding knives. Despite its small size, this model features an extremely sturdy, durable, and reliable structure.
The Ant Rescue, unlike other versions, has a cheek piece in red coloration that allows the operator to more easily locate the knife in case of a fall. This version is equipped with a specific serration that allows cutting ropes and even high-tensile aramid materials. Moreover, this model has a tapered tang that serves as an emergency screwdriver. The Ant Rescue has been developed according to the needs expressed by the "Italian Army Alpine Troops School".
The handle is made of two different elements: the cheek piece crafted from anodized anticorodal aluminum and the hardened steel frame which also serves as the blade lock (Frame Lock System). This mechanism involves a part of the frame bending inward to firmly secure the blade in the open position, enhancing the user's safety during the knife's use.
The tang features a hole for the insertion of a lanyard, and on the right side of the handle, there is a steel clip that allows for concealed carry in the pocket.
The Ant is available in 4 versions with two different types of steel, both provided by Böhler, an Austrian company with which Extrema Ratio has been collaborating for over 20 years, using its highly esteemed materials for the production of its blades.
For the Stone Washed M390 version, Extrema Ratio uses Böhler M390 steel, thermally treated to 61 HRC, which, thanks to a powder metallurgy production process, ensures cutting effectiveness, wear resistance, and oxidation resistance over time.
The blade is sheep foot-shaped and has a small hole on the top part to facilitate opening. Its particular structure, with a straight edge, allows the user to comfortably rest their fingers on the back of the knife and use it with ease.
Type of production: industrial
Blade: in partially serrated stainless steel M390 61HRC
Blade production: Italy
Handle: anodized anticorodal aluminum and steel
Blade length: 70mm.
Blade thickness: 2.2mm.
Closed length: 55mm.
Total length: 127mm.
Balancing: -
Weight: 42g.
Closure: Frame Lock
Clip: removable stainless steel
Sheath: -
Notes:ER-ANT-R-M€112.30Only 0 leftOnly 0 leftOut of stock -
ExtremaRatio - Ferrum Rescue multi tool - Red - knife
Ferrum Rescue is a tool designed for rescue operations, developed in collaboration with my friend Andrea Micheli, military and law enforcement expert, journalist and shooting instructor. Made with a very compact handle, this rescue tool is equipped with 3 blades, each of which has a specific function:
The first and main blade has a thickness of 3 millimeters and is designed to be used for more demanding purposes and to protect the cutting edge of the other two from premature wear. The teeth allow it to cut larger ropes or textile materials, the remaining smooth part has the classic function of a knife. The second blade is a scalpel, which can be used for extremely precise cuts and for emergency first aid interventions. The third blade, on the back of the first, is the smallest of the 3, it has the function of cutting lines, capable of cutting paracord and aramid material.
The interaction of the main blade with the scalpel allows the operator to make a quick emergency cut to free any injured person from his or her clothing.
The line cutter blade and the scalpel are both interchangeable.
Ferrum Rescue has a slim and compact shape, the two anodized anticorodal aluminum grips make up a light, slender and at the same time very resistant handle. It can be housed in a breast pocket, in small flashlight holsters or inside a single loop of the M.O.L.L.E. system. On the back there is also a hard metal glass breaker.
Equipped with a flipper assisted opening system, the blade rotates on ball bearings which allow a smooth and uncertain movement of the blade. This mechanism allows the operator to open the blade quickly and easily, even with just one hand. The locking system adopted is the well-tested liner lock. The reversible clip is positioned on the back.
The reversible clip is positioned on the back.
Intended use: Tactical / EDC
Type of production: Industrial
Country of production: Italy
Blade: N690Co 58HRC stainless steel
Blade finish: Satin
Handle: Rough Anticorodal
Blade length: 56mm.
Blade thickness: 3mm.
Closed length: 90mm.
Total length: 170mm. (18mm. INCLUDING SCALPEL BLADE)
Weight: 85g.
Closure: Liner Lock
Clip: Removable and reversible, in stainless steel
Packaging: Cardboard box with Extrema Ratio logos
Note: -ER-FE-RR€237.70Only 0 leftOnly 0 leftOut of stock -
ExtremaRatio - BF0 R CD - Stone Washed - knife
It is a small basic folder, produced with a technopolymer handle that enhances its resistance and lightness, thanks also to the steel frame. The blade locking mechanism is the tried and tested LINER-LOCK. The model keeps all the features of the BF0 updated with the new High Speed Razor Opening opening system. Available in the following versions: BF0 R CD Desert with stone washed blade and HCS and BF0 R CD Stone Washed with stone washed blade and black grip.
Type of production: industrial
Blade: stainless steel N690Co 58HRC
Country of production: Italy
Handle: Nylon with stainless steel folders
Blade length: 55mm.
Blade thickness: 2.5mm.
Length closed: 85mm.
Total length: 140mm.
Weight: 53g.
Closure: Liner Lock
Clip: reversible and removable, in stainless steelER-BF0R-SW€79.51Only 0 leftOnly 0 leftOut of stock -
ExtremaRatio - BF0CD - Stone Washed - knife
Type of production: Industrial
Blade: N690Co 58HRC stainless steel
Country of production: Italy
Handle: Nylon
Blade length: 55mm.
Blade Thickness: 2.5mm.
Closed Length: 85mm.
Overall length: 140mm.
Weight: 75g.
locking system: Liner Lock
Clip: reversible and removable, stainless steelER-BF0-SW€0.00Only -20 leftOnly -20 leftOut of stock -
ExtremaRatio - N.K.3 Stone Washed - Neck Knife - NK3 - knife
NK3 is a small knife that extends the family of the neck knives Extrema Ratio.
It differs from the models NK1 and NK2 for the largest size of the blade-type "long" 70mm. The ergonomic grip is designed so as to prevent accidental cuts during withdrawal from the scabbard.
On the back it is formed a drain for the positioning of the thumb or index depending on use. The structure enables both use for work or cutting very effective for small precision work.
The Kydex sheath is a quick release and is supplied to the port of paracord knife in his neck.
intended use: Neck Knife
type of production: Industrial
production country: Italy
Blade: stainless steel N690Co 58 / 60HRC
Blade treatment: Stone Washed
manicatura: stainless steel N690Co 58 / 60HRC
blade length: 70mm.
blade thickness: 6.3mm.
total length: 153mm.
Weight: 82g.
Sheath: Kydex, neck
Package: Cardboard box with logos Extrema Ratio
Notes: possibility of using the sheath with MOLLE systems or Tek-Lok (not included in the package)12450€132.79Only 0 leftOnly 0 leftOut of stock
