Double-Locking mechanism Raised rivet construction 23 locking positions 16'' twist chain Used and trusted by the Army, Secret Service, and Special Forces These UZI leg irons feature raised rivet construction, double-locking mechanism, 16'' twist chain, and 23 locking positions. Comes in a nickel finish. UZI combines advanced technical concepts with innovative designs to produce products used and trusted by the Army, Secret Service, and Special Forces. Since its launch in the 1950s, UZI has become one of the world's most famous firearm brands and a 20th century icon.