Vertical Grinder, Wheel Diameter 7 in, Horsepower 3.1 hp, For Wheel Type Type 27, Max. Speed 6,000 RPM, Air Inlet 1/2 in NPT , Air Inlet Connection Size 1/2 in, Air Inlet Gender , Air Inlet Type NPT, Lever Type Lever, Spindle Thread Size 5/8 In.-11, Duty Heavy Duty, Speed Ranges 0 to 6000 RPM