Smith & Wesson Handcuffs are fabricated from the finest quality carbon or stainless steel. They are made with heat treated internal lockworks, featuring smooth ratchets for swift cuffing and double locks to prevent tampering. Smith & Wesson is a proven worldwide leader in handcuff and restraint production. Along with the key actuated lock, all of our handcuffs come with a double locking system. The double locking system is actuated by means of a slot lock.