The spring-loaded cylinder is compressed by the workpiece and locked in place using the cam handle. Locking direction can be changed from clockwise to counterclockwise by removing the retaining pin. Built-in disc spring prevents loosened locking. The body is made from 1045 steel with a black oxide finish. The piston is made from SK95 steel, quenched and tempered, with a black oxide finish. The cam handle is made from 4140 steel, quenched and tempered, with a black oxide finish.