Specifications: 1) Free speed: 11,000rpm2) Air inlet (PT): 1/4"3) Air hose (ID): 3/8"4) Average air consumption: 6cfm (171.6L/min)5) Suggested air compressor: 2.5HPFeatures and functions:1) The water-feed installation favors your marble and stone cutting work by water flow on the working area and does no harm to your body due to non-dust atmosphere at operation2) AT285WH at high speed does a cutting job by taking up a diamond cutting disc (wet) from 5 to 4 inches3) Great for marble and stone cutting 4) Front exhaust