Angle Grinder Wheel Diameter 4 1/2 in Horsepower 1.3 hp For Wheel Type Type 27 Max Speed 12 000 RPM Air Inlet 3/8 in NPT Female Air Inlet Connection Size 3/8 in Air Inlet Gender Female Air Inlet Type NPT Lever Type Safety Lever Spindle Thread Size 5/8 In.-11 Reach Standard Reach Duty Heavy Duty Variable Speed No