This Transport Restraint System uses a combination of our Model 1 Universal Handcuff and Model 1900 Leg Irons both in satin nickel finish. The chain length between cuffs is 32"". 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.