Just Add Motor and Belt!5/8" x 12" shaft is threaded on both ends with 1/2" diameter 20 tpi Right Hand and Left Hand thread so you can mount grinding wheels on one end and buffing wheels on the other. Permanently sealed and lubricated ball bearing pillow blocks. 2" v groove pulley, locking shaft collars, hex nuts, and four 1/8" dia. machined flanges.