Neiko 30115B Extended Air Die Grinder, 5" | 3/8" Hose Size Designed for high speed grinding with a free speed of 22,000 RPM Extended shaft allows easy access for those hard to reach areas Throttle padded style lever makes for easy control and feathering of grinder speed Made for precision, rear exhaust air flow system directs air away from work surface Specs: 90 PSI air pressure, 1/4" inlet size, and 3 CFM air consumption