This Dremel accessory (520) is an impregnated polishing wheel designed for light stock removal and high luster polishing The polishing wheel is impregnated with a silicon carbide abrasive and cooling lubricant, so polishing compound is not needed A polishing wheel is ideal to use on surfaces including steel, aluminium, brass, silver, gold and other metals as well as hard plastics Working diameter 13.2 mm; shank diameter 3.2 mm; recommended maximum speed 20,000 RPM Fits with all Dremel Multi-/Rotary tools or other 3,2mm shank size multi- / rotary tools