ITEM NAME:2pcs Diamond Holesaws Tile Ceramic Glass Slate Porcelain Marble Drill Bits for Description: Mainly used for drilling Porcelain Tile, Ceramic Tile, Marble, Granite ,Rebar Concrete and other hard material. Suitable for drilling the faucet mounting holes in stone counter tops, plumbing lines in showers, and vanities. Small incision resistance,feature drilling stably, fast speed, not breaking the border. Opening neat, smooth, no broken edges, no phenomenon, chip Easily Gold paints on the body of this bit to avoid getting rusty. Specification: Method of Use: Use Wet or Dry To prolong its using life, must use with water for cooling and lubrication. The hole saw can be used with Bench drill, hand electric drill. When you using hand electric drill, start slowly, 45 degree angle, go vertical after you make an initial mark. Material: Diamond Color: Gold Size: Approx. Overall Length: 85mm/ 3.35inch Shank Diameter: 9mm/ 0.35inch Opening Diameter: 40mm/ 1.57inch, 45mm/ 1.77inch Package Includes: 1 Piece 40mm Drill Bit 1 Piece 45mm Drill Bit Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. SKU: DMO0014427819459210.Mainly used for drilling Porcelain Tile, Ceramic Tile, Marble, Granite ,Rebar Concrete and other hard material. The hole saw can be used with Bench drill, hand electric drill. When you using hand electric drill, start slowly, 45 degree angle, go vertical.