Dynabrade 18075 3-Inch 76 mm Diameter Autobrade Red Long-Neck Cut-Off Wheel Tool, 20000 RPM, Rear Exhaust, 3/8-Inch - 24 Spindle Thread Accepts optional Cut-Off Wheels, 3-Inch diameter with 3/8-Inch center hole Extension design offers easy access to tight or confined areas. Design also allows for easier straight-type cuts Rear exhaust; 20,000 RPM. Composite tool grip absorbs vibration and reduces cold air transmission to operator Important: Speed of tool must not exceed maximum operating speed of accessory. Always use proper guards, wear eye gear and body protection