Extrema Ratio Knives

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Machete Extrema Ratio KS 0410000172BLK 24.3cm
Machete Extrema Ratio KS 24.3cm 0410000172BLK
Made famous by the Gurkha regiments serving under the British crown, the “kukri” is a Nepalese all-purpose blade descended from ancient Greek sickle-shaped swords. It’s ultimately a machete with a top-heavy, forward-positioned cutting edge, which enables it to function as an axe while retaining the versatility of a long blade. Extrema Ratio has developed two such tools, our KS and KH models, blending ancient and modern design concepts. Both employ combination grinds. The razor-like hollow grind closer to the grip yields a fine, sharp edge without compromising the overall thickness of the back of the blade (which needs great sturdiness). The tip portion of the blade is instead flat ground, well-angled to effortlessly penetrate wood and vegetation. While similar tools are usually made from softer steel alloys for elasticity and ease of honing, we were able to achieve adequate elasticity using hard BÖHLER N690 steel, making for a remarkably durable edge.
€346.77

In stock

Folding knife Extrema Ratio T911 04.1000.0164/SW 7.6cm
Folding knife Extrema Ratio T911 7.6cm 04.1000.0164/SW
Extrema Ratio T911 folder is a light, medium sized folding knife, designed for professional use by military operators. It features a Bohler N690 cobalt steel modified spearpoint blade heat treated to 58 HRC for best compromise between toughness, ease of sharpening and edge retention.
The blade is 76 mm (3”) long and 4 mm (0.16”) thick, with a stone washed finish and flat edge, and rotates around a pin that can be adjusted for tension, allowing the user to achieve the desired smoothness while deploying the blade. Once adjusted, a secondary screw locks the pin in position.
The handle is hard anodized Anticorodal aluminum alloy, with a black finish, shaped for ease of transition between reverse and saber grip. The blade deploys from the folded position by the usual thumb stud and is secured by a liner lock with an additional safety system to insure maximum reliability under hard use. The safety lever is red colored for better visibility and engages the safety in its forward position for a more instinctive use.
The handle has an integrated belt cutter with easily available industrial grade cutter blades, tungsten carbide glass breaker, a stainless-steel folding marlin-spike and a flat screwdriver in AISI 420 steel, meant to help in rifle scope adjustment. A clip is fixed at the end of the handle, allowing for a deep, concealed carry position with very little of the knife exposed. The clip can be reversed from left to right side. Overall 194 mm. Weight 145 g. Made in Italy.
€258.87

In stock

Folding knife Extrema Ratio BD2 Lucky Desert 0410000228DW 9.6cm
Folding knife Extrema Ratio BD2 Lucky Desert 9.6cm 0410000228DW
Extrema Ratio BD2 Lucky is a folding knife with a desert-colored handle and guard. The BD2 Lucky perfectly combines the elegance of classic Italian style and the functionality of an EDC knife. The ergonomic handle uses anodized aluminum alloy, and the blade is made of Böhler N690 cobalt steel. The guard also functions as a flipper.
€153.23

In stock

Folding knife Extrema Ratio Glauca J1 0410000165RVHCS 11cm
Folding knife Extrema Ratio Glauca J1 11cm 0410000165RVHCS
This folding knife Extrema Ratio Glauca J1 has been developed together with material experts of Jagdkommando Unit, the Austrian Army special force. The blade-tip is designed to maximize penetration. It also features a glass-breaker, a clip with three attach positions and a safety lock. Its handle is produced with a particular finishing, improving its grip. The desert kydex sheath is M.O.L.L.E. system compatible and accomodates the knife with its blade extended.
€441.94

In stock

Neck knife Extrema Ratio N.K.1 Desert Warfare 04.1000.0123/DW 5.1cm
Fixed blade Knife Extrema Ratio N.K.1 Desert Warfare 5.1cm 04.1000.0123/DW
Extrema Ratio N.K.1 Desert Warfare version. Extrema Ratio N.K.1 Black fixed is a reduced-size knife is based on the skinner and perfected to a true tactical knife. The design of the handle prevents accidental injury while drawing. A groove on the back of the blade accommodates for the user’s index finger or thumb, according to wielding style. Due to its overall construction, the N.K.1 is both capable of offense, through very effective slashing strikes, and useful for minute precision work. Total length 129 mm. Blade length 51 mm. Weight 56 g. The included, rapid- release Kydex sheath comes with a paracord strip for neck carry. Further, it can be attached via MOLLE system to tactical vests or to any of the compatible cordura sheaths from Extrema Ratio. Available but not included: belt clip (for attaching sheath to a belt), polymer under shirt system (for concealed carry). Available versions: N.K.1 Black, N.K.1 Desert Warfare, N.K.1 Stone washed.
€131.45

In stock

Folding knife Extrema Ratio BD2 R 04.1000.0227/SAT 9.6cm
Folding knife Extrema Ratio BD2 R 9.6cm 04.1000.0227/SAT
Extrema Ratio BD2 R is a medium folder of the BD series. Its handle produced in aluminum makes it light and resistant, also thanks to its steel internal frame. They keep all BD2 characteristics, improved with the new high speed Razor opening system.
€132.26

In stock

Folding knife Extrema Ratio BD1 R 0410000226SAT 7cm
Folding knife Extrema Ratio BD1 R 7cm 0410000226SAT
Extrema Ratio BD1 R is a knife designed for lightness. It is characterized by a very slim profile with a focus on lightness, without renouncing the usual Extrema Ratio toughness and reliability, also thanks to the black anodized, Anticorodal grip. The modified spearpoint, satin blade is made in Bohler N690 steel hardened to 58 HRC, 2.75” (70mm) long, 0.1” (2.5 mm) thick, with a plain sharpening and a faux edge on the first third of the spine. The blade is deployed by the usual “Razor” tang extension which enables effortless ambidextrous operation. A simple yet sturdy liner lock system holds the blade open. The reversible clip with lightening holes contributes to maintain the weight of the knife to a minimum. Scallops milled in the handle help to guarantee a solid grip on the knife and facilitate grip transitions. With an overall length of 6.7” (170 mm) and a weight of just 2.7 oz (75 g) the Extrema Ratio BD1 R is an extremely light and slim knife which makes it an ideal EDC choice.
€129.03

In stock

Folding knife Extrema Ratio MF2 Black Ruvido 04.1000.0142/RVB 11.3cm
Folding knife Extrema Ratio MF2 Black Ruvido 11.3cm 04.1000.0142/RVB
Extrema Ratio MF2 is a knife from the Medium Folders series. According to the Extrema Ratio classification, the Medium Folders series is located between Basic Folders (Light Folders) - simple, light and universal knives and Heavy Folders - heavy and powerful folding tools. Extrema Ratio MF2 Black Ruvido is a version with additional processing of the handle with a special polymer composition. Ruvido in Italian means "rough". The blade is made of BöHLER N690 STEEL (58HRC). The weight of the Extrema Ratio MF2 Black Ruvido knife is 194 g.
€307.26

In stock

Tactical knife Extrema Ratio Ermes Satin Ordinanza 0410000443SAT-OR 14cm
Fixed blade Knife Extrema Ratio Ermes Satin Ordinanza 14cm 0410000443SAT-OR
The Extrema Ratio Ermes is a commemorative knife with the satin-finished blade designed by the Special Operations Helicopter Regiment (R.E.O.S.), which is part of the Italian Army Aviation. R.E.O.S. is a helicopter operational unit supporting the special forces, composed of personnel specially equipped and trained to support hostilities in each operational context. The stylized knife guard represents the wings present in the regiment's heraldic symbol. Hybrid Kydex and fabric sheath has a belt attachment with MOLLE system.
€356.45

Shipping after 10-20 business days

Tactical knife Extrema Ratio Ermes Black Operativo 0410000443BLK-OP 14cm
Fixed blade Knife Extrema Ratio Ermes Black Operativo 14cm 0410000443BLK-OP
The Extrema Ratio Ermes is a full-black commemorative knife designed by the Special Operations Helicopter Regiment (R.E.O.S.), which is part of the Italian Army Aviation. R.E.O.S. is a helicopter operational unit supporting the special forces, composed of personnel specially trained and equipped to support hostilities in each operational context. The stylized knife guard represents the wings present in the regiment's heraldic symbol. Hybrid Kydex and fabric sheath has a belt attachment with MOLLE system.
€326.61

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Folding knife Extrema Ratio BD2 Lucky Black 0410000228BLK 9.6cm
Folding knife Extrema Ratio BD2 Lucky Black 9.6cm 0410000228BLK
Extrema Ratio BD2 Lucky is a fully black folding knife with guard. In addition to protecting the users's hands, the guard also acts as a flipper, and the high-speed auxiliary knife opening system makes it easy to use. The BD2 Lucky perfectly combines the functionality of an everyday pocket knife with the elegance of classic Italian style. The streamlined blade is made of Böhler N690 cobalt steel, and the ergonomic handle uses anodized aluminum alloy.
€160.48

In stock

Folding knife Extrema Ratio BD4 Lucky Desert 0410000497DW 12.3cm
Folding knife Extrema Ratio BD4 Lucky Desert 12.3cm 0410000497DW
Extrema Ratio BD4 Lucky is a folding knife with a partial serrated sharpening and a guard, made in a desert color. BD4 Lucky perfectly combines the elegance of classic Italian style and the functionality of a folding knife for every day. The guard also functions as a flipper, and the high-speed auxiliary opening system of the knife makes it easier to use. The ergonomic handle uses anodized aluminum alloy, and the blade is made of Böhler N690 cobalt steel.
€168.55

In stock

Folding knife Extrema Ratio BD4 Lucky Black 04.1000.0497/BLK 12.3cm
Folding knife Extrema Ratio BD4 Lucky Black 12.3cm 04.1000.0497/BLK
Extrema Ratio BD4 Lucky is a folding knife with a guard and a partial serrated sharpening, made entirely in black. The guard also acts as a flipper, and the high-speed auxiliary knife opening system makes it easy to use. The BD4 Lucky perfectly combines the elegance of classic Italian style with the functionality of a EDC folding knife. The streamlined blade is made of Böhler N690 cobalt steel, and the ergonomic handle uses anodized aluminum alloy.
€179.84

In stock

Folding knife Extrema Ratio MF0 T Black 0410000148BLK 6.8cm
Folding knife Extrema Ratio MF0 T Black 6.8cm 0410000148BLK
Extrema Ratio MF0 is a multifunctional folding knife, which is the lightest model in the MF (Medium Folder) line. The knife retains all the characteristics of the MF1, being in fact a smaller version of it. The knife is equipped with a 7 cm blade. The knife blade is made of Austrian alloy steel Böhler N690 (58 HRC), traditional for Extrema Ratio.
€233.87

In stock

Folding knife Extrema Ratio Panthera Black 0410000135BLK 10cm
Folding knife Extrema Ratio Panthera Black 10cm 0410000135BLK
Extrema Ratio Panthera is a fully black folding knife. This model has absolutely identical characteristics to the T-Razor model, because it is from which Panthera draws inspiration. The difference in this silhouette is that the dorsal part, like in the blades of the Wharncliffe, goes down to the tip of the knife. The Extrema Ratio Panthera features a Razor-called high-speed assisting deployment system, which makes the knife easier to use.
€188.71

In stock

Folding knife Extrema Ratio Panthera Satin 0410000135SAT 10cm
Folding knife Extrema Ratio Panthera Satin 10cm 0410000135SAT
Extrema Ratio Panthera with a satin-finished blade. The model retains all the characteristics of the T-Razor Extrema Ratio model, from which Panthera draws inspiration. The difference in this silhouette is that the dorsal part descends to the tip of the knife, similar to Wharncliffe blades. The Extrema Ratio Panthera features a high-speed assisting deployment system called the Razor, which makes the knife easier to use.
€204.03

In stock

Folding knife Extrema Ratio Resolza 10 Stone washed 04.1000.0168/SW 10cm
Folding knife Extrema Ratio Resolza 10 Stone washed 10cm 04.1000.0168/SW
Extrema Ratio Resolza 10 is a folding knife with stonewashed blade that pays homage to centuries of tradition of Italia. The traditional Sardinian resolza is one of the most famous Italian knives. So far it is a constant companion of island farmers and shepherds in their daily work. The knife accompanied them even when people were called to war: during the World War I in the chronicles of Sassari the knife is mentioned as part of equipment of soldiers. Resolza 10 is an attempt to redefine the traditional silhouette in accordance with the modern Extrema Ratio standards, so as not to overlook the Sardinian craftsmen, who still preserve ancient traditions and practice ingrained knife-making techniques. Resolza 10 retains its original dimensions and proportions, but is manufactured using modern company technologies and high quality materials. The handle has been redesigned, and the blade is more closely approximated to the traditional shape.
€154.84

In stock

Folding karambit knife Extrema Ratio Nightmare Stonewashed 04.1000.0454/SW 7.3cm
Folding knife Extrema Ratio Nightmare Stonewashed 7.3cm 04.1000.0454/SW
Extrema Ratio Nightmare is a karambit folding knife with rescue characteristics. It has been adopted by the special units of U.S.I.V.P. Principality of Monaco Police. Its name comes from the development and consultancy department of Monaco special intervention units. It comes with a standard industrial-grade cutter blade which is easily replaced, a reversable pocket clip, a glass braker placed in the finger ring. It is produced both in black and stone washed version.
€241.94

In stock

Folding knife Extrema Ratio Glauca B1 04.1000.0139/BLK 10.7cm
Folding knife Extrema Ratio Glauca B1 10.7cm 04.1000.0139/BLK
This new folding knife comes out from a cooperation and planning phase with G.I.G.N. (special unit of the French national Gendarmerie). To maximize penetration, a special blade tip has been developed. On the back side of the handle it has a special tool to cut plastic handcuffs. It comes with a rear glass breaker, reversible clip and safety lock. The sheath has a hard ABS structure on a cordura basis and it has several possible ways of fixing: MOLLE system for tactical jackets, belt fixing and side fixing. The sheath is planned to be used with open blade knife.
€459.68

Shipping after 10-20 business days

Neck knife Extrema Ratio N.K.1 Black 04.1000.0123/BLK 5.1cm
Fixed blade Knife Extrema Ratio N.K.1 Black 5.1cm 04.1000.0123/BLK
Extrema Ratio N.K.1 Black fixed is a reduced-size knife is based on the skinner and perfected to a true tactical knife. The design of the handle prevents accidental injury while drawing. A groove on the back of the blade accommodates for the user’s index finger or thumb, according to wielding style. Due to its overall construction, the N.K.1 is both capable of offense, through very effective slashing strikes, and useful for minute precision work. Total length 129 mm. Blade length 51 mm. Weight 56 g. The included, rapid- release Kydex sheath comes with a paracord strip for neck carry. Further, it can be attached via MOLLE system to tactical vests or to any of the compatible cordura sheaths from Extrema Ratio. Available but not included: belt clip (for attaching sheath to a belt), polymer under shirt system (for concealed carry). Available versions: N.K.1 Black, N.K.1 Desert Warfare, N.K.1 Stone washed.
€128.23

In stock

Survival knife Extrema Ratio Ontos Black No Kit 0410000127BLKNK 16.8cm
Survival knife Extrema Ratio Ontos Black No Kit 16.8cm 0410000127BLKNK
The Extrema Ratio Ontos Black No Kit is a durable knife for tough outdoor tasks. This version does not include a survival kit. The name ONTOS translates from Greek as "phenomenon." Part of the blade's upper surface is serrated. The 168 mm blade is crafted from premium Bohler N690 steel with a special black MIL-C-13924 coating. The durable black Forprene elastomer handle features a lanyard hole. A M.O.L.L.E. system sheath is included. The knife weighs approximately 411 g.
€319.35

In stock

Training knife Extrema Ratio TK S 2 GOI 04.1000.0316-TK 14.2cm
Training knife Extrema Ratio TK S 2 GOI 14.2cm 04.1000.0316-TK
Training knife Extrema Ratio TK S 2 GOI with 142 mm blade. Weight 173 g. Training knives enable martial arts practitioners and professionals to train different combat techniques with an appropriate and dedicated tool. All training knives are produced in a metallic blue colour which makes them easily identified even when sheathed. The blades are produced from anodized aluminum and have the very same shape and size of the Extrema Ratio standard production models. The handles are the same used in Extrema Ratio´s production models. The sheaths, sold separately, are the same used for the real knives. The stiff blade allows for training complex defensive and disarming techniques. We recommend the use of appropriate protective gear when training.
€54.84

Shipping after 10-20 business days

Folding knife Extrema Ratio BF2 CD Black Ruvido 04.1000.0145/RBV 8.7cm
Folding knife Extrema Ratio BF2 CD Black Ruvido 8.7cm 04.1000.0145/RBV
Extrema Ratio BF2 CD Black Ruvido version. BF2's are “Full size” folding knives especially suitable for professional use by military or police operatives on the field. The handle is solid and comfortable, with the reversible clip becoming a useful and comfortable resting point for the thumb in a “reverse” grip. Characteristical lowered flat areas in the handle give access to the opening “pins”, which don’t protrude from the knife when closed. The flat-ground blade is available in a drop-point or a tanto shape, featuring an extra-thick and stout tip (as in model BF1). The renowned LINER-LOCK blade-blocking system is paired with a carter-protected, manually-activated secondary blocking system.
€181.45

Shipping after 10-20 business days

Extrema Ratio knives are a part of equipment of many special military units of Italy, the police and rescue services. Each model is developed very carefully and undergoes a series of rigorous tests before it is put into production. Extrema Ratio cooperates with the University of Perugia, where scientists conduct a number of studies determining the ergonomics of Extrema Ratio products and methods for improving it. The office of Extrema Ratio is located in Prato, Italy.

Both Extreme Ratio tactical knives and EDC knives are distinguished by impeccable quality. Most knives are made of Austrian steel N690, which is famous for its high content of molybdenum and cobalt and is highly corrosion resistant. Due to this, N690 steel has increased strength and resists shock loads well. The most popular Extrema Ratio knives are Fulcrum, Col Moschin, RAO, Adra and others. Extrema Ratio also produces several lines of tactical folding knives: BF (basic folder), MF (medium folder), BD4, BD2 series and other knives. In our store you can buy Extrema Ratio tactical knives, as well as folding and EDC knives of this brand. MyGoodKnife is the official distributor of Extrema Ratio.