The above 1/4" Air Die Grinder with 22,000RPM free speed is great for Production, Work Deburring and Finishing Fabricated Metal! Free speed:22,000RPMAverage air consumption: 4CFMCollet size: 1/8", 1/4", 3mm, 6mmExhaust: RearLength:173mmWeight: 0.582Kg, 1.283LbsWorking pressure:90psi, 6.3kg/cm2Hose size: 3/8"Air inlet:1/4" Aluminum body 1/4" Air Die Grinder