Chicago Pneumatic 872 1/4" General Duty Air Die Grinder. Lock off throttle to prevent accidental start up. Rear exhaust directs air away from the workpiece. Built in regulator matches speed to the job. Complete with 1/4" and 6mm collet. Applications - tire scuffing, cleaning tire moldings, general high speed polishing and grinding. Free speed - 22000 rpm. Specifications: collet size - 1/4", cfm - 4, hose size - 3/8", free speed - 22000 rpm.