This holder is part of the Quick Zero system. These clamp modules are used to locate and clamp a workpiece in conjunction with the Quick Zero Base and Quick Zero Plate. This holding clamp secures workpieces by attaching to holding clamps and custom risers. Secure the holder to the Quick Zero Base (QZSD-C6-B). The body is made from 4130 steel, carburized hardened, with a black oxide finish. The clamping screw is made from 4135 steel, quenched and tempered, with a black oxide finish.