Smith & Wesson's most popular handcuffs are fabricated from the finest quality carbon steel for strength and nickel-plated for corrosion and wear-resistance. The S&W Model 100 restraints are manufactured with heat-treated internal lockworks, featuring smooth ratchets for swift cuffing and double locks to prevent tampering. These handcuffs meet or exceed the US Nation Institute of Justice Restraint Standards and are standard police equipment for many law enforcement agencies.