Extrema Ratio

Japanese steel merges with Italian excellence

For this 2019/2020 collaboration, exclusive to Collini Cutlery, we have decided to offer a series of best sellers produced by Extrema Ratio. Knives made with the famous San Mai steel produced by the Japanese Takefu Steel. Specifically, for the central sheet we used the carbonaceous V-Toku2 at 62 / 63HRC and the stainless SUS410 for the two external sheets, in order to guarantee a very high cutting, penetration and sealing capacity of the wire together with an ease of regrinding and maintenance but at the same time the blade has a remarkable resistance to corrosion and an important increase in resilience given by the type of foreign steel and the laminated structure.

FULCRUM C model: for this First Production Run, a circulation of 10 pieces numbered from 1 to 10 was produced.

FULCRUM C is the compact version of FULCRUM, it maintains all the characteristics of solidity and robustness and, thanks to the reduced dimensions of the blade (only 110 mm) and the handle, it is easily portable and concealable. The rigid sheath can be positioned horizontally, vertically or in a 45 ° inclined position. The only safety of the sheath is automatic with extraction and re-insertion by pressure, this detail makes it an intuitive and extremely fast tool, particularly suitable for emergency use and for personal defense.

Use: backup knife
Blade: integral, in Japanese laminated steel (San Mai) with cutting edge in V-Toku2 (carbon) at 62 / 63HRC and external cheeks in SUS410 (stainless steel)
Blade thickness: 6.3 mm.
Blade length: 90 mm.
Total length: 210 mm.
Balancing: set back to 0.5cm. from the guard branch
Weight: 210g.
Sheath: ABS with Tek-Lok multiposition attachment
Notes: Numbered edition - cardboard box with Extremaratio logos and certificate

As in the ancient swords of the Japanese Samurai.

Rolled steel - imported into Italy from Collini Steel directly from the Japanese Takefu Steel - is based on the ancient Japanese tradition in the creation of the famous Samurai swords. Already in 1100 the expert Japanese blacksmiths in fact combined different materials to give the Katana swords incredible cutting capabilities combined with a resistance and flexibility previously unknown. It is thanks to this revolutionary construction technique that the swords from Samurai have been preserved to the present day becoming one of the most fascinating objects made by man. Following this tradition applied to modern metallurgy, we are now able to have technologically advanced steels already tested and used in cutlery also by famous brands such as Fallkniven, Cold Steel, Mcusta, Kai, Sog, Zwilling, Rockstead, etc.

Characteristics of San Mai steel: These are different types of metals bonded together to create a composite that encloses and intensifies the strengths of the metals taken individually:

- Longer tool life
thanks to the use of high quality steel with a high carbon content (V-Toku2, VG10, CoS, Shiro) or sintered (SPG2), in the heart of the sheet (Core Steel), the blade once hardened, reaches hardness and cutting performance significantly higher than that achieved with the use of traditional steels.

- Greater resilience
built with the principle of Japanese swords, multilayer steel is difficult to break thanks to the toughness of the central steel (Core Steel) and the elasticity of the steel used for the lateral coating (Stainless Steel).

- Better corrosion resistance
the steel used for the external layers (Stainless Steel) guarantees the blade a high resistance to corrosion. The combination of the two or more materials used by Takefu Steel generates, at the galvanic level, a structure that improves the corrosion resistance also on the wire.

- Easy processing even after heat treatment
although normally the steel becomes harder after hardening, the lateral steel used in multi-layer processing does not lose its softness and allows easy processing, drilling or welding even after heat treatment. For optimum performance of the blade, cryogenic treatment is recommended.

- Improvement of the aesthetic result
The knives made with multistate steel or with damask pattern at the end of the processing are aesthetically elegant, refined and highly appreciated by collectors all over the world.

This knife is a Collini Cutlery exclusive edition, the one and only Karambit blade ever made by Extrema Ratio and you will not be able to find it in other stores - This is a very small worldwide limited edition of 50 serialized pieces.

Blade: 58HRC N690Co Testudo Stainless Steel
Country of production: Italy
Handles: Black satin anticorodal
Blade Lenght: 90mm.
Blade Thinckness: 4mm.
Total Lenght: 205mm.
Hole Diameter: 22mm
Weight: 152g.
Sheath: Kydex with Tek-Lok
Notes: Worldwide limited edition, only 50pcs each serialized

ExtremaRatio - SKAR - Karambit Collector's Edition - knife

SKAR COLLECTOR'S EDITION

Available in only 10 numbered copies (from 1 to 5 in the version black blade and 1 to 5 in the blade clear version), this edition of the Skar Extremaratio is sold in an elegant box in polymers with the version Skar training aluminum.

Intended Use: collection / CQB

Type of production: Industrial, Limited
Blade: stainless steel N690
Treatment Blade: Stonewashed
Production Lama: Italy
Handle: Anticorodal removable grips
Blade length: 90mm.
Blade Thickness: 4mm.
Overall length: 205mm.
Hole diameter: 22mm
Balancing: back, 2 cm from the branch guard
Weight: 152g.
Sheath: Kydex, thermoformed, connection type Tek-Lok
Notes: Limited edition and numbered with certificate, in only 5 pieces
Housing: plastic, with logos ExtremaRatio

Faithful implementation of the 1/1 scale SKAR. Entirely anodized aircraft aluminum, this Karambit is made by Extrema Ratio in collaboration with Cutlery Collini Busto Arsizio.

Free tip and sharp, this knife offers a realistic feeling and maximum safety during training and practice of martial arts that require the use karambit.

Intended Use: Training
Production: Italy
Lama: Aeronautical Aluminum 6061 T6
Treatment: Anodizing
Handle: series comes the paracord to assemble; select the drop down menu under the favorite color! E 'can also purchase the handle in aluminum that are mounted on steel version SKAR.
Blade length: 90mm.
Blade Thickness: 4mm.
Overall length: 205mm.
Hole diameter: 22mm
Weight: 34g.

This knife is a Collini Cutlery exclusive edition, the one and only Karambit blade ever made by Extrema Ratio and you will not be able to find it in other stores - This is a very small worldwide limited edition of 50 serialized pieces.

Blade: 58HRC N690Co Testudo Stainless Steel
Country of production: Italy
Handles: Black satin anticorodal
Blade Lenght: 90mm.
Blade Thinckness: 4mm.
Total Lenght: 205mm.
Hole Diameter: 22mm
Weight: 152g.
Sheath: Kydex with Tek-Lok
Notes: Worldwide limited edition, only 50pcs each serialized

This knife is a Collini Cutlery exclusive edition, the one and only Karambit blade ever made by Extrema Ratio and you will not be able to find it in other stores - This is a very small worldwide limited edition of 50 serialized pieces.

Blade: 58HRC N690Co Stonewashed Stainless Steel
Country of production: Italy
Handles: Black satin anticorodal
Blade Lenght: 90mm.
Blade Thinckness: 4mm.
Total Lenght: 205mm.
Hole Diameter: 22mm
Weight: 152g.
Sheath: Kydex with Tek-Lok
Notes: Worldwide limited edition, only 50pcs each serialized