Our NEW Model 100 LEVER LOCK handcuffs offer a new, patented double locking system. The double lock is simply activated with your finger. No extra tools/keys are necessary. 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. All S&W handcuffs meet or exceed demanding U. S. National Institute of Justice tests for workmanship, strength, corrosion and tamper resistance..