JINGLING 10mm 3/8 inch Diamond Hole Saw Drill Core Bit Diameter for Marble Stone Granite Tile Pack of 2Pcs New Professional diamond Marble hole saw core drill for Marble Stone Granite Tile Made of high quality diamond with precision drilling speed and long life use. Application: Mainly used for drilling Porcelain Tile, Ceramic Tile, Marble, Granite ,Rebar Concrete and other hard material. Ideal for drilling the faucet mounting holes in stone countertops, plumbing lines in showers, and vanities Method of Use: Use Wet or Dry. To prolong its using life, must use with water for cooling and lubrication.