Grinding Discs are used for the removal of metal and heavy coatings. They are also suited for weld and fiberglass grinding and blending, heavy-duty deburring and metal finishing. Use also on wood. Look here for a big selection in the 3M line of Fibre-Backed Disc, including "Grit-Lok" and "Roloc", as well as the accessories to use with them, like a Disc Pad Hub, a Disc Pad Face Plate and Disc Retainer Nuts.