Product Description Air Grinder Straight Free Speed 24,000 RPM PS 0.5HP Collet 1/4" Rear Exhaust Variable Speed Yes Grinder Type Straight CFM at full load 21.0 Average CFM at 15 seconds Run Time 10.5 Handle Material Aluminum Min. Hose Size 3/4 ", Overall Length 5.5 ", Required Pressure 90 psi, Air Intake 1/4" NPT, Bearing Type Ball, Throttle Lever Features Durable, Includes Wrench, Industrial Industrial Manufacturer of Chicago. The pneumatic air grinder is excellent for cleaning tire molds, porting and relieving engines, high-speed polishing and grinding. Built-in regulator adjusts the speed to the respective task. The robust, energy-efficient 0.5 HP motor delivers a free speed of 24,000 rpm. This die features a rear exhaust to direct air away from work, an adjustable power regulator for precise control, a throttle valve to prevent accidental starting, and a square handle design for good grip. It measures 5-1/4" long and comes complete with a 1/4" collet chuck.