Rubber sleeve keeps hands from getting cold or slip Don’t use polishing pads bigger than 125 mm (5"). There is easy to cause damage to the tool. Front thumb-adjustable water knob enhances the tool control. No visible water tube and screw make a seamless smooth touch and no more break risk when dropping. Cast from aircraft aluminum. The watertight sealed bearings provide long life and smooth rotational speeds. The water and air controls are simple to use and conveniently located. Rear air vent removes exhaust through a hose protector, away from operator's hands. The tool is a powerful, reliable air tool ideally suited for continuous wet polishing in stone industry, and is safer when used wet! Detachable rotor and gear design brings you an economical repair Specification: 1. Free Speed:4500 rpm 2. Air Inlet:1/4" 3. Air Pressure:6kg/cm2 4. Air Consumption:660L/min 5. Net Weight:1220g 6. Tool Length:235mm 7. Exhaust System: Front 8. Packing:10pcs/21kg/22kg/1.38'