Hiatt standard nickel finish handcuffs are constructed of high carbon steel for uncompromising strength and are nickel plated for durability. These use heavy duty rivets with large rivet heads for even more added strength. The push pin double lock is located on the edge of the handcuffs so you can easily locate the pin and double lock your cuffs so they do not over tighten on your prisoner. The built in backloading feature makes preloading your cuffs more efficient and easy. These handcuffs have a triple pawl lock that is extremely shim resistant. Hiatt handcuffs come with 2 keys and a lifetime warranty against manufacturer defects.