Smith & Wesson handcuffs are fabricated from the finest quality steel. They are manufactured with heat treated internal lockworks, featuring smooth ratchets for swift cuffing and double locks to prevent tampering. Smith & Wesson handcuffs meet or exceed demanding U.S. National Institute of Justice tests for workmanship, strength, corrosion and tamper resistance. Features: Keyless Double-Locking System for ConvenienceHeat-Treated Internal LockworksSmooth Ratchets