Orbital Action. Unique "thru-the-pad" water feed floats the pad on a fluid film effecting uniform grit penetration for ultra-surfacing or heavy duty sanding. 20 high-pressure hose connected to water source ensures constant adjusted flow. High Performance, Air-Efficient Motor with sealed 4-bearing shaft assures full-pad contact, maximum productvity. Comes complete with water hose.Specifications:- RPM: 8500+- Wt: 3lbs. 14oz.- Air Consumption: 10.2 cfm @ 90 PSI- Noise Level: 76 dBa- 90 Day Warranty