These spiral cam clamps provide quick clamping with high holding forces. The simple design and small size allow for faster set up and more parts per load. Turning the handle clockwise forces the cam forward against the workpiece. CP135AL includes a bracket plate to prevent marring. The clamp is made from 4140 steel, HRC33-39, with a black oxide finish. The handle made from 4140 steel, RC30-35 with a black oxide finish. The clamping plate is made from 304 stainless steel with a natural finish.