1. This air angle grinder is used for polishing and grinding various metal molds. 2.Lightweight aluminum alloy housing, high quality and durable, long service life. 3.Quality bearings for smooth and powerful operation, high precision. 4.Integral baffle with rear exhaust gives quite operation. 5. This air die grinder kit is suitable for professional users. Features: 1. This air angle grinder is used for polishing and grinding various metal molds. 2.Lightweight aluminum alloy housing, high quality and durable, long service life. 3.Quality bearings for smooth and powerful operation, high precision. 4.Integral baffle with rear exhaust gives quite operation. 5. This Air Die Grinder Kit is suitable for professional users. Features: Item Name: Air Die Grinder Material: Aluminum Alloy Aluminum Color: Silver+Black Free Speed: 20000-23000RPM Collet Size: 1/4inch (6mm) Air Inlet (NPT): 1/4inch Working Air Pressure: 90PSI Air Consumption: 4CFM Exhaust: Rear Overall Length: 156mm / 6.1inch Package Weight: About 448g Packing List: 1 * Air Die Grinder 2*wrench 1*adaptor Note: Installation instruction is not included, the professional operation is highly recommended.