Overall diameter 2″.Accepts and supports 3M Roloc Bristle Discs for smoother collision repair work.Shank easily attaches to a range of drills and air tools with 1/4-20 EXT threads.Hard rubber pad provides support for RolocT Bristle Discs, improving finishes.Roloc attachment allows operators to switch discs in seconds for greater productivity.Sold 10 per case.