All black construction with aluminum chain. Interlocking, unitized frame. The cuff structure is forged from high strength stainless steel. Each restraint is then over molded with ordnance grade polymer under 75 tons of pressure. The Lock Assembly is unitized and replaceable. A flat contact bow improves application. There is a key hole and double lock slot on each side of each restraint. A double lock warning bar is readily visible. The frame geometry, deep set teeth and precision smooth action eliminates the need for back loading.