Attach this mandrel to an electric motor for high quality sanding, polishing or buffing operations. UNUSED, in original box, with operating instructions (retails for $85 US) This ball bearing double-end mandrel (model 4224) has two high-quality precision grade die-cast ball bearing pillow blocks. Will run wheels up to 1" thick. Use with flap wheels, wire brushes, buffing and grinding wheels having a 1/2" arbor hole. 12" overall; Pulley diameter 2"; shaft diameter is 5/8" threaded 1/2"- 20 Right and left hand. The keyless chuck can be mounted on the right hand end to allow use of various accessories such as sanding drums, mounted points, etc.