This knife is used exclusively by US Naval Forces. Ontario Knife Company has produced the following knives for many decades and all have seen combat with US Armed Forces. Needless to say, these veteran blades are not in the business of giving quarter. Specifications Blade Length: 6" Overall Length: 10.75" Blade Thickness: 0.17" Blade Finish: Black Oxide Blade Grind: Flat Blade Material: 440A Stainless Steel Blade Hardness: 49-54 HRC Handle Material: Polypropylene Sheath Material: Cordura and Plastic