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. Now with a better rivet design.