The ASP Chain Handcuffs provide major advantage in both the design and quality construction of wrist restraints. Precision design comes from extensive computer modeling and simulation analysis. Lock strength is maximized through its interlocking and unitized frame. The structure of these products is forged from high-quality stainless steel on custom built from high speed and progressive dies. Each handcuff is overmolded with ordnance grade polymer under 75 tons of pressure. It comes with a keyway and double lock slot on both sides of the restrain, and both double and single locks are released by turning the key in one direction.