Dynabrade 18000 Autobrade Red Straight-Line Die Grinder, 25000 RPM, Rear Exhaust, 1/4-Inch Collet Compact, lightweight design Includes safety-lock lever; rear exhaust Smooth, efficient air motor with built-in speed regulator Composite tool grip absorbs vibration and reduces cold air transmission Optional 1/8-Inch collet insert: 18432