General description This professional quality air tool set is ideal for grinding and polishing metal components. The air die grinder is well made and features a safety trigger that requires a flick of the thumb to release before the handle can be operated, preventing accidental operation. The kit includes 10 mounted grinding stones with 1/4 inch and 1/8 inch shanks, and it is supplied complete in a carrying case. Technical specifications Type: Air Die Grinder Diameter shanks: 1/4 inch (5 mounted grinding stones), 1/8 inch (5 mounted grinding stones) Collet: 1/8 inch BSP Nipple: 1/4 inch Includes: 2 spanners Air inlet: 1/4 inch NPT Requires: 3/8 inch hose (not supplied) Free speed: 22,000 RPM Air pressure: 90 PSI Air consumption: 3 CFM Air tool length: 17 cm (6.75 inch)