A high quality tool suitable for occasional or everyday use. Ideal for grinding and polishing metal components. Speed of the air die grinder 22000 RPM The grinder has a safety trigger that requires a flick of the thumb before the handle can be operated (perfect for preventing accidental operation). Supplied in a blow molded storage tray for easy transportation and storage. Includes; 1 x air die grinder 5 x mounted grinding stones 1/4" diameter shanks 5 x mounted grinding stones 1/8" diameter shanks 1/8" collet 1 x 1/4" BSP nipple / connector 2 x spanners for changing the stones Specifications; 1/4" Standard Collet for any 1/4" or 6mm burr or attachment. 1/4" BSP Air Inlet. Free speed of 22,000 RPM Nominal operating pressure 90 PSI. Air consumption 3 CFM (manufacturers rating). We would recommend around 5 CFM for this type of tool.