1.3 hp Depressed Center Wheel Grinder is ideal for fast weld and stock removal, heavy deburring, plus rust and scale removal. 13,500 RPM, 3/8"-24 Spindle Thread. Tool accepts optional 4" (102 mm) diameter Type 27 Depressed Center Wheels with 5/8" (16 mm) center hole. Includes Wheel Guard and two Universal Flanges. Vibration Dampening Side Handle included.