Die Grinder, Straight Line, Free Speed (RPM) 20,000, 1 HP, Rear Exhaust, 11 Average CFM @ 15 Second Run Time, 44 CFM @ Full Load, 1/4 In. Collet, Required Pressure (PSI) 90, Air Inlet NPT (In.) 3/8, Min. Hose Size (In.) 3/8, Ball Bearing Type, Composite Material, Composite Handle Material, Lever Throttle, Variable Speed No, Length (In.)