Features: 1) Banlanced ball bearing construction 2) Built-in regulator for positive speed control 3) Positive locking clamps hold sand paper firmly in position 4) Automatic release throttle lever with positive stop action 5) Contoured palm-grip for one-hand operation 6) Make fast work of smoothing fiberglass, wood, and body filler And take care of any sanding job on paint, metal, and fiberglass 7) Rear exhaust 8) Free speed: 8, 000(rpm) 9) Air inlet (PT): 1/4" 10) Air hose (ID): 3/8" 11) Avg. Air consumption: 6cfm, 171. 6l/min 12) Sug. Air comp. (HP): 2. 5 Inner packing: Color box Outer packing: 10pcs/ctn Carton dimensions: 61 x 27 x 21(cm)