1、ZINC ALLOY: The main body of the grinder is made of zinc alloy and wrapped with red sheath, which is light in weight and corrosion resistant. 2、STANDARD SIZE: This pneumatic air grinder is standard in size, with 1/4in inlet port, 3/8in inlet pipe, and has 3/8in 24UNF collet thread for stability and no leaks. 3、HIGH EFFICIENCY: Running continuously at a maximum speed of 4000RPM, equipped with air regulator for easy accurate cutting, grinding, shaping and sanding. 4、SAFE OPERATION: Rear exhaust reduces sound levels while ensuring exhaust does not hit the operator face, and intake filter keeps grinders from contamination. 5、STRAIGHT DESIGN: This pneumatic grinder has a straight handle, ergonomically designed, comfortable and effortless to hold, suitable for long term operation.