Chicago Pneumatic 873 Low Speed Air Tire Buffer with Slip Chuck 2,500 RPM. Chuck Size/Wheel Size: 7/16", Avg. Air Consumption: 4 CFM, Air Inlet NPTF: 1/4", Min. Hose Size: 3/8", Sound Dba Pressure: 98 - 108, Power Vibration: 2.5, Free Speed: 2500 RPM. Quick change slip chuck for fast and easy change of buffing wheel. Lock off throttle to prevent accidental start up. Rear exhaust directs air away from work piece. Built-in regulator matches speed to job.