Air Die Grinder Grinder Type Straight Free Speed 35 000 rpm 0.4 HP Rear Exhaust 5.75 Average CFM @ 15 Second Run Time 23.0 CFM @ Full Load 1/4 in Collet Required Pressure 90 psi Air Inlet 1/4 in NPT Min Hose Size 1/4 In. Ball Bearing Type Composite with Rubber Grip Handle Material Lever Throttle Variable Speed No Overall Length 8 In.