ACDelco AND402 1/2-inch Drill Pneumatic Tool, 1300 RPM Handle exhaust design reduces noise and directs air away from work Teasing throttle provides exact control 1/2" (13 mm) keyless chuck for efficient bit change. Spindle thread: 3/8-inch -24 UNF. Side handle increase the convenience and comfort operation 3.7 CFM air consumption. Sound Power Level at 99 dB(A).