Ball and roller bearing construction. Metal gear housing. 3-position side handle, mounts on either side or top of grinder. Spindle lock for easy wheel changes, 5/8"-11 spindle size. Paddle switch for comfortable operation. 10A, 11,000 RPM. Includes 2-position side handle, 4-1/2" x 3/16" depressed center wheel guard assembly, backing flange, and plastic storage case.