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Extrema Ratio

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6 Items

  1. ExtremaRatio - Frame Rock Titan - Blue Satin - folding knife

    The Extrema Ratio Frame Rock is a new knife, based on the Ti-Rock project, a successful frame-lock knife made by Extrema Ratio in 2016 exclusively for Coltelleria Collini.

    The Extreme Ratio Frame Rock is characterized by the titanium handle that offers great resistance while being very light. The integrity of the frame-lock locking system is guaranteed against wear by an easily replaceable hardened steel insert.

    Unlike its drop-point predecessor, the Rock frame has a spearpoint blade 75 mm long, 6.0 mm thick, equipped with fuller for further lightening. The blade is made of Bohler N690 steel, heat treated to a hardness of 58 HRC. The same is available in black finish with DLC or satin finish.

    To make the opening even more fluid and free of uncertainties, the blade rotates on ball bearings. This mechanism allows the user to adjust the force necessary to release the blade from the closed position.

    The shape of the reversible clip allows a hidden port in the pocket, making the knife not visible from the outside. The large, solid handle and the well-proportioned blade allow this knife to tackle demanding tasks. Frame Rock weighs less than 200g, making it somewhat light for such a sturdy knife. It is supplied inside an ABS box.

    Intended use: collection / CQD

    Type of production: industrial,
    Blade: in N690Co stainless steel
    Blade treatment: Satin finish
    Country of production: Italy
    Handle: in Titanium, machined from solid, with integral Frame Lock closure system with removable hinged and safe made of stainless steel
    Blade length: 75mm.
    Blade thickness: 6.3mm.
    Total length: 181mm.
    Weight: 193g.
    Clip: stainless steel, reversible, deep pocket type and with tip up port
    Notes: Conical Skull Crasher inserted in the shank
    Box: in ABS with Extrema Ratio logos

    ER-FR-BS
    €454.92
    Only 99 left
    Only 99 left
  2. ExtremaRatio - BF2 V Stone Washed Knife - Sailing Knife

    This knife was designed and perfected in every detail for its primary use in the marine environment. The blade has a flat rounding that allows symmetrical cutting work with wider support. The tip, on the other hand, which is thick and durable thanks to the tanto version, allows greater penetration and a sharper, more precise cut. The stone washed finish process facilitates locating in the marine environment.

    The structure of the handle, made of anodized anticorodal aluminum, features a design with milling in concentric circles and lightening and anti-slip perforations so as to facilitate rinsing from saltiness. A small slot is cut into the middle of the cheek piece to allow for tightening or releasing smaller shackles. BF2 V is equipped with reversible clip; adjusting screw retainer for closing and opening the blade; 70-mm. knot shock ankle with fastening mechanism; and correctable. The presentation of the BF2 V took place on the Amerigo Vespucci School Ship.




    Intended use: sporting/nautical

    Type of production: industrial
    Blade: stainless steel N690Co 58HRC with Stone Washed finish
    Country of Production: Italy
    Handle: Anticorodal with stainless steel reinforcements
    Blade length: 65mm.
    Blade thickness: 3mm.
    Length closed: 124mm.
    Total length: 190mm.
    Weight: 149g.
    Closure: Liner Lock
    Clip: reversible and removable stainless steel
    Notes: Anklet/knife lock - Small sized turnbuckle - Quick-release tactical corrector - Open knife safety catch - Safety catch for Anklet/knife lock

    ER-BF2V
    €188.52
    Only 2 left
    Only 2 left
  3. ExtremaRatio - Ti-Rock Satin Limited Edition - Laminated CoS & Blue Titanium - PRIVATE COLLECTION - knife

    KNIFE WITHDRAWN FROM PRIVATE COLLECTION
    * Type: Previously purchased
    * Condition: Like new, never taken out of its packaging.
    * Commercially available: Discontinued
    * Sharpening: Factory
    * Marks on blade: None
    * Marks on handle: None
    * Box: Present
    * Scabbard: /
    * Manuals, Certificates and Warranties: Present
    * Checked and Certified by our in-house laboratory


    Coltelleria Collini exclusive - Available in only 33 numbered examples on blade and box


    Intended use: collection / EDC / CQD

    Type of production: industrial, limited
    Blade: Japanese laminated stainless steel (San Mai) with cryogenically hardened 61.5HRC CoS cutting edge; with double concave shank in the strong of the blade
    Blade treatment: satin finish
    Country of manufacture: Italy
    Handle: made of Titanium, machined from solid, with integral Frame Lock system with removable casement and safety made of stainless steel
    Blade length: 75mm.
    Blade thickness: 6.3mm.
    Total length: 180mm.
    Weight: 186g.
    Clip: stainless steel, reversible, deep pocket type and with tip up port
    Notes: tapered Skull Crasher engaged in the tang - Limited and numbered edition of only 33 pieces serialized on the blade and box
    Box: cardboard, numbered, with ExtremaRatio and Coltelleria Collini logos

    TIROCK-C-BL-CP
    €483.61
    Only 0 left
    Only 0 left
    Out of stock
  4. ExtremaRatio - Frame Rock Titan Knife - Blue Satin - PRIVATE COLLECTION - folding knife

    Knife withdrawn from a private collection - In like new condition - Never regrind - Checked and certified by our in-house Coltelleria Collini laboratory.

    The Extrema Ratio Frame Rock is a new knife, based on the Ti-Rock project, a successful frame-lock knife made by Extrema Ratio in 2016 exclusively for Coltelleria Collini.

    The Extreme Ratio Frame Rock is characterized by a titanium handle that offers great resistance while being very light. The integrity of the frame-lock system is guaranteed against wear by an easily replaceable hardened steel insert.

    Unlike its drop-point predecessor, the Rock frame has a 75mm long, 6.0mm thick spearpoint blade fitted with a fuller for further lightening. The blade is made of Bohler N690 steel, heat treated to a hardness of 58 HRC. The same is available with a black finish with DLC treatment or satin.

    To make opening even more fluid and without uncertainty, the blade rotates on ball bearings. This mechanism allows the user to adjust the force necessary to obtain the release of the blade from the closed position.

    The shape of the reversible clip allows a hidden port in the pocket, making the knife not visible from the outside. The large and solid handle and the well-proportioned blade allow this knife to tackle heavy tasks. The Frame Rock weighs less than 200g, making it somewhat light for such a sturdy knife. Comes inside an ABS box.

    Intended use: collection / CQD

    Type of production: industrial,
    Blade: N690Co stainless steel
    Blade treatment: Satin finish
    Country of production: Italy
    Handle: Titanium, machined from solid, with integral Frame Lock closure system with removable flap and safety made of stainless steel
    Blade length: 75mm.
    Blade thickness: 6.3mm.
    Total length: 181mm.
    Weight: 193g.
    Clip: stainless steel, reversible, deep pocket type and with tip up port
    Notes: Conical Skull Crasher inserted in the tang
    Box: in ABS with Extrema Ratio logos

     

    AP-ER-FR-BS
    €0.00
    Only -50 left
    Only -50 left
    Out of stock
  5. ExtremaRatio - BF2H Helmsman - Multitool Sailing Knife

    Helmsman is a knife designed and perfected in every single detail for its primary use in a nautical environment and represents the evolution of the BF2 V model presented on the Amerigo Vespucci School Ship in 2013 and dedicated to the most beautiful ship in the world.

    The blade, which reaches a length of 87 mm, has a serration at the base while the tip has a flat grinding that allows symmetrical cutting work with wider support while the stone washed finishing process preserves more from corrosion in a marine environment.

     

    Intended use: Sports / Tactical / For Sailing Boat

    Type of production: industrial
    Blade: N690Co 58HRC stainless steel with Stone Washed finish
    Country of production: Italy
    Handle: Anticorodal with stainless steel reinforcements
    Blade length: 87mm.
    Blade thickness: 3mm.
    Length closed: 124mm.
    Total length: 210mm.
    Weight: 143g.
    Closure: Liner Lock
    Clip: reversible and removable in stainless steel
    Notes: ankle band / loose knots - small shackle - Tactical quick release hanger - Safety catch with open knife - Safety ankle fastener / Knot release

    ER-BF2H
    €200.82
    Only 0 left
    Only 0 left
    Out of stock
  6. ExtremaRatio - Ti-Rock Satin SanMai CoS - Titanium Blue - Limited Edition - folding knife

    A Coltelleria Collini Exclusive - Limited edition, available in only 33 serialized pieces


    Intended Use: collection / EDC / CQD

    Type of production: Industrial, Limited
    Blade: Japanese-rolled stainless steel (San Mai) with sharp CoS to 61,5HRC in cryogenic quenching; with fuller double concave in the strong blade
    Blade treatment: Satin finish
    Production Country: Italy
    Handle: Titanium, Billet, with full Frame Lock locking system with sash and secure removable made of stainless steel
    Blade length: 75mm.
    Blade Thickness: 6.3mm.
    Overall length: 180mm.
    Weight: 186g.
    Clips: stainless steel, reversible type deep pocket and port tip up
    Notes: Skull Crasher tapered shank engaged in - Edition limited and numbered edition in only 33 serialized pieces on the blade and box
    Box: cardboard, numbered, with ExtremaRatio logos and Coltelleria Collini

    TIROCK-C-BL
    €0.00
    Only -99 left
    Only -99 left
    Rating:
    100%
    5
    Out of stock
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