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 productivity. Comes complete with pierce plate, water hose, and 1 pad( picture shows other pad options).