1/4 hex bit drive. Power drill operated. 0-400 RPM. With HSS-E cutter blades. Used to deburr or angle cut the outside diameter of threaded ends, tubes, axles, pipes etc. with diameters from 3mm (1/8\") to 19mm (3/4\"). Works with steel, copper, brass, stainless fiberglass, plastics and wood. Note: Steel may require oil cooling / lubrication.