Angle Grinder Wheel Diameter 4 1/2 in Horsepower 0.9 hp For Wheel Type Type 1 Type 27 Type 41 Type 42 Max Speed 12 000 RPM Air Inlet 1/4 in NPT Female Air Inlet Connection Size 1/4 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