High power 4 HP (maximum motor HP) 8000 RPM motor with overload protection provides higher operating speeds under load. Wheel Diameter (in.): 7, Amps: 15, Speed (RPM): 8,500, HP: 4, Switch Type: Trigger with lock-on switch, Spindle Thread Size: 5/8in. x 11, Spindle Lock: Yes, Side Handle: Yes, 5-position, Variable Speed: No, Wheel Included: Yes Epoxy-coated field and armature provide long service life against abrasion from airborne debris Can run on both AC and DC power Keyless adjustable guard allows for guard adjustments to be made without tools Low-profile gearcase allows for work in tight areas Automatic turn-off brushes shut down the tool when brushes need to be changed to avoid tool damage 2-wire double insulated S jacket rubber cord provides increased durability and life in hot and cold climates Lightweight increases productivity in extended use applications Max Watts Out: 3084 Watts Use Wheels RPM Above: 8500 RPM