Description:4-inch Diamond Wet Polishing Pads with a Rubber Backer Pad.Diamond powder and resin, Grinding force and polishing speed, with high finish, high wear resistance and long service life.Use for Marble, Concrete, Tile, Stone, ect, is the suitable grinding and wet polishing tool. Hook and Loop backed polishing pads for easy connect and removal, with water hole in center, color coded Hook and Loop backer to easily identify polishing pads grit.Easy to polish flat contoured surfaces or edges. Through the Rubber Backer Pad, installed on the . Maximum 12000 RPM.Note: Need to add water when polishing.Not suitable for grinding of concave and convex surface, so as to avoid damage.