SPECIFICATIONS Disc Size: 3" Free Speed: 21,000rpm Dimensions: 188x50x105mm Weight: 0.8Kg Recommended operating pressure: 6.3bar (90psi) Avg Air Consumption cfm(l/min): 3(85) Recommended Air Pressure : 90psi Noise level : 85.2 dBA (96.2dBA power) Vibration : 2.88m/s2