Tile Glass Diamond Starrett Smooth Coated Drill Bit Hole Saw suitable for use in drill hole on glass, marble, tile or granite, especially suitable for calcium silicate board ,diamond coating on this hole saw give superior performance and longer life.Excellent for making clean and accurate hole on glass, and tile.provides exceptional performance and effective cutting action on non-metallics and other difficult to cut materials. Diamond edge saws produce clean, accurate cuts and offer extended life well beyond that of conventional tools. Works better with a electric drill(here is not included).Diamond drill bits ,or diamond core drill bits, diamond hole saw or bonded diamond drill bits. They are often referred to as glass drill or tile drill, but since they are used to drill glass, ceramic, porcelain, tile, ceramic tile, limestone, Slate, marble, granite, stone and glass fiber light, so they are more general.