Free Speed(RPM):1600 Chuck Size:3/8” Motor:0.4 HP Air Inlet:1/4” NPT Hose Size(I.D.):3/8” Rec. Air Pressure:90 PSI Avg. Air Consumption:0.38 M3/MIN Overall Length:8 1/2” Packing:18PCS/23KGS/1.2’