Air Die Grinder is ideal for many automotive and. industrial high-speed grinding applications. It can be used to clean dies, rotors, backing plates and brake pad mounts, or to grind valve seats, dress welds and enlarge holes. Suitable for most grinding work, de-burring and polishing metal components. Contoured throttle lever with positive self-locking, prevents accidental starting of motor. Operating pressure ; 90 PSI. Air consumption; 9.5 cfm (270 l/min). Free speed; 25,000rpm. Collet size 1/4". Body length 142mm. Body diameter 35mm