Detailed Product Description Built-in speed regulator, comes complete with 3 resin fiber backing pads, (3",4-1/2",5-1/2").Designed for light sanding jobs like feather edging,and rust removal.Side exhaust. Free speed: 18,000rpm Air inlet (PT): 1/4" Air hose (ID): 3/8" Avg. air consumption: 4cfm, 115l/min