Time-saving ball bearing head punches faster than wrench method. Requires less than half the force of conventional ratchet drivers. Punches up through 10 gauge (3.5 mm) mild steel with Greenlee Standard and Slug-Buster punches. and 16 gauge (1.5 mm) stainless steel with Greenlee Slug-Splitter SC punches. Ratchet action allows for use in confined areas. Unique design eliminates stud rotation during punching - lowers the strain on studs. Steel carrying case.