Works for most professional handcuffs Includes a large keychain Comes in black Used and trusted by the Army, Secret Service, and Special Forces The UZI Rotating Handcuff Key works for most professional handcuffs, includes a large keychain, and comes in a black 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.