This universal Handcuff features a push pin double lock design along with the hinged design to further restrict movement in a satin nickel finish. These cuffs open 12% larger for big wrists and close 11% smaller for thin wrist for better security7. Smith & Wesson Handcuffs are fabricated from the finest quality carbon steel. They are manufactured with heat treated internal lockworks, featuring smooth ratchets for swift cuffing and double locks to prevent tampering.