Blade: Bohler N690 Cobalt Steel
Model: MK2.1B
Made in Italy
About Extrema Ratio:
Extrema Ratio, located in Prato, Italy has been designing, manufacturing and selling high-quality combat knives since 1997. The company gained a great reputation for excellence that is unsurpassed in the military and tactical industry.
The company prides itself in design, material and quality to deliver a high end product that meets the most severe standards. The first class handwork and well-selected material have contributed to form the image of the Extrema Ratio trademark all over the world.
Product Description:
A classic revisited, a tribute to a war veteran: MK2.1 is the restyling of the MARK 2 fighting dagger, one of the most widespread knives in World War II.
Our aim with such an ambitious design project was to retain the characteristic qualities of the original, while only introducing those changes we deemed strictly functional to its improved effectiveness.
The Blade is manufactured from Cobalt Steel, with AISI 303 and AISI 304 employed for other parts, and Glass-fiber-strengthened Nylon replaced Leather on the Grip. It retains the ergonomics of the original Mark 2 while all structural parts have been oversized to obtain a sturdy and high-performance Multi-purpose knife.
The most significant changes are aimed at fixing the known “weak spots” of the parent knife: these include toolless in-the-field disassembly ability, a straightened modified Bowie profile making for easier edge maintenance, and barrel-shaped grooves on the hilt which both help user properly orient the blade in the dark and improve user’s grip in twisting movements (“screwdriver” effect).
Minor additions include safety-cord holes in the tang and pole-mounting holes on the front guard. Our usual Extrema Ratio “side groove” replaced the traditional Blood-groove fuller for improved looks and reduced weight. Includes a standard thigh sheath with automatic retention mechanism and protective flap.
The material used for the Blade is Bohler N690 Cobalt Steel, nicknamed „Austrian 440“. The Steel has its nick from the Austrian manufacturer Bohler, who is the only company that makes this steel, worldwide.
The N690 is closely related to 440C. The N690 is containing more cobalt and some other materials than 440C. This makes the N690 more corrosion resistant and harder than the original 440C.
The Grip is made out of black Nato-Mil-Spec Thermoplastic Elastomer Forprene. Forprene is an extremely tough synthetic material which feels like hard rubber. The Grip is slip resistant with or without gloves, with wet or dry hands.
The MK2.1 carries in a double Sheath style Sheath with Leg Strap which is Molle-compatible. The outer Sheath is a Nylon soft Sheath. Inside there is a hard Sheath made of a Nylon Composite with 15% Fiberglass. This is where the Blade actually rests.
Made in Italy.
Technical Specifications:
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Blade: Bohler N690 Cobalt Steel
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Edge Type: Spear Point, Straight Edge
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Blade Length: 177 mm
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Overall Length: 305 mm
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Blade Finish: MIL-C-13924 Coating, Black
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Handle: Forprene, Black
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Rockwell Hardness: 58 HRC
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Blade Thickness: 6.4 mm
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Weight: 393 grams
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Serial Number: On Blade
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Sheath: Cordura, Black, Nylon Composite Liner, Molle Compatible, Leg Strap
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Origin: Italy
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