With up to 5,000 rpm free speed, you can work faster on light and heavy sanding jobs, including roughing body filler, removing rust, and smoothing welds. Pad diameter: 7"; average air consumption: 8 cfm; sound dBA: 97.3/110.3; air inlet NPTF: 1/4"; minimum hose size: 3/8"; spindle size: 5/8" - 11; weight: 4.2 lbs.