This Ball Bearing double-end mandrel has two high-quality precision grade die-cast ball bearing pillow blocks Threaded shaft ends are 1/2" The shaft is 11" long; The maximum outside distance between the pillow blocks is 8" Will run wheels up to 1" thick. Use with flap wheels, wire brushes, buffing and grinding wheels having a 1/2" arbor hole. Pulley diameter 2", shaft diameter is 5/8" threaded 1/2"- 20 Right and left hand threads. 12" overall. This mandrel is unused, in original box. Note the seller is in Metchosin; item still available if ad posted.