The Patella is designed to be worn on the leg, but can be worn anywhere on the body. The blade is constructed from Stainless Steel, with a hardness of 55-56HRC. The knife is low-profile and designed to be worn close to the body, eliminating “line traps” and minimizing drag. The Patella incorporates a hardened butt, useful for those times you need a hammer as well as a knife. Whether you are freediving, scuba diving, spearfishing, diving wrecks, diving reefs or any other activity... this knife is a tank and will serve you well!