Use with electric grinder, grinding all kinds of soft metal, metal rust removal, removal of burrs reaming Including 5 different shapes, can process various surfaces of objects An for ideal for your woodworking, carving, engraving, and polishing for Head Diameter: 11mm / 0.4in, Handle Diameter: 6mm / 0.24in, Length: 59mm / 2.3in carbon steel, & long for time service, Manufacturer: Beimus