ATD Tools 2088 6" Random Orbital Palm Sander Includes oil, 6 inch vinyl face pad, wrench, orbital sander and 1/4 inch male nipple Working pressure is 90 PSI, free speed is 10,000 RPM, air inlet thread is  inch, NPT hose size is 3/8 inch, average air consumption is 2.8 CFM and minimum air compressor hp needed is 2 hp plus