Angle Grinder Wheel Diameter 4 in Horsepower 1 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 3/8 In.-24 Reach Extended Reach Duty Heavy Duty Variable Speed No