Works for most professional handcuffs Comes in silver Used and trusted by the Army, Secret Service, and Special Forces These handcuff keys works for most professional handcuffs and has a silver 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.