Pencil Grinder General Free Speed 60 000 rpm Average CFM @ 15 Second Run Time 0.86 0.86 CFM @ Full Load 0.10 HP Rear Exhaust Type Variable Speed Yes Min Hose Size 1/4 In. Whip Hose I.D. 1/4 In. Hose Length 5 In. Air Inlet 1/4 in NPT Overall Length 4-1/2 In. Collet Capacity 3mm Required Pressure 90 psig Large Precision Bearings Tool Weight 0.7 lb.