"3m Disc Sander Kit 5"" . Convenient hook and loop attachment. Adapts a 1/4"" or 3/8"" electric drill so is may be used as a 5"" disc sander. ncludes three Velcro-backed sanding discs (120-, 80- and 40-grit). Recommended Usage: Sanding fiberglass/gelcoat, paint, wood and metal Abrasive Material: Aluminum oxide Backing Type: Hook and loop ...