metal hardware two connected cuffs with a chain or hinged bar a keyhole for unlocking the cuffs a locking mechanism to secure the cuffs around the wrists a double-lock mechanism for extra security
handcuff which has metal hardware handcuff which has two connected cuffs with a chain or hinged bar handcuff which is a keyhole for unlocking the cuffs handcuff which is a locking mechanism to secure the cuffs around the wrists handcuff which is a double-lock mechanism for extra security