The Speedway High Speed Sander features a free speed of 18,000 RPM. This sander is ideal for light sanding jobs such as feather edging and rust removal. Three resin fiber backing pads are included: 3 inch, 4-1/2 inch, and 5 inch. It has a built-in speed regulator as well as side exhaust. The air inlet on the sander is ¼ inch and the air hose is 3/8 inch. Its average air consumption is 4 CFM.