The Smith & Wesson handcuffs are made of carbon steel. The handcuffs have 23 locking positions. Handcuffs meet U. S. National Institute of Justice tests for workmanship, strength, corrosion, and tamper resistance.Police Issue Carbon Steel With Nickle Finish Smith And Wesson HandcuffsPasses All NILEC And NIJ SpecificationsDouble Lock Slot Both Sides23 Locking PositionsWrist Opening: 2.04" Irst Notch Inside Perimeter: 8.4" Last Notch Inside Perimeter: 5.8" Tightest Inside Width: 1.8" Distance Between Cuffs: 2" Maximum Overall Length: 8.98"Uses Standard KeyThis Item Is Restricted For Export And Cannot Be Sold For Use In Some Countries Outside The U.S.