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The Extrema Ratio neck knife series has now been extended with the addition of the NK3 K neck knife. Like the others, it is a light weight, compact knife that can fit almost anywhere. Backpack, pocket, bugout bag, and of course, hanging on your neck. This model has a black finish.


The blade and handle are essentially one piece. The blade is a smooth extension of the handle. There is an indented formed section on the lower edge to protect your index finger when you are extracting the NK3 K from its sheath. This allows you to remove the NK3 K safely from the sheath. It also marks the end of the handle. The blade has a section that Extrema Ratio calls a “blood slot” on each side of the blade. They extend almost the full length of the blade section. Has a razor edge tanto blade.

The handle and blade are designed so you can extend your index finger or thumb along the upper part of the blade for precision cutting and for extra pressure. A sturdy karambit type ring is on the handle end and this creates a distinctive looking neck knife. Also, the ring can be used to rapidly extract the knife from the sheath.


The sheath is sturdy and constructed from Kydex. It covers just the sharpened blade leaving the handle free for you when extracting the NK3 K. It is laced with a quality lanyard that allows the knife to be suspended around your neck. The sheath retains the NK3 K securely even when the knife is suspended on your neck.

The Extrema Ratio NK3 K is a compact, versatile knife. Blending Italian design with quality workmanship.

Total Length of Knife: mm 171.96 (6.77 inches)

Blade Length: mm 69.85 (2.75 inches)

Total Length of Knife and Sheath: mm 190.50 (7.50 inches)

Weight of Knife: g 93.55 (3.30 ounces)

Weight of Knife, Sheath, Lanyard: g 136.08 (4.80 ounces)

Blade Thickness (Widest Part): mm 6.35 (0.25 inches)

Blade Width (Widest Section): mm 21.34 (0.84 inches)

Blade and Handle Steel: Bohler N690 cobalt stainless steel*

Blade and Handle Hardness: Rockwell 60 HRC

Grinding: Flat

Serrations on Blade: No

Sheath Material: Kydex**


* The blade is made with N690 cobalt stainless steel; a high performance steel with excellent cutting and sharpening characteristics. This steel is also used in the butchering industry and to make surgical instruments.

** Kydex is a thermoplastic that is waterproof and scratch resistant. Withstands high temperatures. Tough and durable. Easy to clean.

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000-04-1000-0213-blkADVERTISED PRICE $187.00CLICK TO SEE HOW MUCH YOU SAVE! map price $187.00
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