Sioux Pneumatic 1/4" Mini Right Angle Die Grinder Model: 5055A Lockoff lever throttle Comfort grip Aluminum housing Built-in speed regulator Free speed: 20,000 rpm Collet size: 1/4" Air inlet size: 1/4" NPT Recommended hose size: 3/8" (10 mm) Air Consumption: 4.0 cfm (113 l/s) avg, 16.0 cfm (452 l/s) maximum This tool has been tested and does work as it should It also does show signs of use