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The Extrema Ratio ARDITI BLACK is a special limited edition – only 1918 were made. The original knife was created out of a necessity for a hand-to-hand combat weapon in World War I. The ARDITI Unit* cut off their long bladed, unwieldy, “Vetterli” bayonets to make an effective close combat weapon.


The ARDITI is a single edge dagger. Very sharp right out of the box. Elegant black blade with the traditional dagger shape.


Classic shaped handle with generous guards to protect your hand, The number of the edition is on the handle along with the date “2018” to show it is a 100 year celebratory edition.


Designed to be carried on your belt and is also MOLLE compatible. The belt strap that connects to the sheath where the ARDITI rides can be removed. This leaves you with a MOLLE compatible stripped down sheath.

Length of Knife: mm 269.75 (10.62 inches)

Blade Length: mm 166.88 (6.57 inches)

Total Length of Knife and Sheath: mm 304.80 (12.00 inches)

Weight of Knife: g 215.46 (7.60 ounces)

Weight of Knife and Sheath: g 343.03 (12.10 ounces)

Blade Thickness (Widest Part): mm 6.30 (0.24 inches)

Blade Width (Widest Section): mm 22.86 (0.90 inches)

Blade Steel: Bohler N690 cobalt stainless steel**

Blade Hardness: Rockwell 58 HRC

Grinding: Flat grind

Handle: Polymer

Handle Length: mm 100.58 (3.96 inches)

Sheath Material: Cordura and rigid polymer

MOLLE Compatible Sheath: Yes


* According to Wilkpedia: the name ARDITI was the name used by a “Royal Italian Army elite special force” in World War I. “The name derives from the Italian verb ardire ("to dare") and translates as "The Daring [Ones]".”

** The blade is made with N690 cobalt stainless steel, a high performance steel with excellent cutting and mechanical characteristics. This steel is also used in the butchering industry and for making surgical instruments.

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