Features Beautiful And Efficient Work: This Diamond Drill Bit Is Coated with Thick Diamond Coating on Both Sides And Ends, So Can Be Wet Or Dry Ground without Debris, Scratches, Or Protrusions, Making Beautiful Holes. Time Saving: Using This Diamond Drill Bit to Expand The Hole Can Save A Lot of Trouble And Time. Applicable Materials: Used for Granite, Marble, Artificial Stone, Glass, Quartz Stone, Vitrified Bricks, Etc. 5pcs: There Are 5 Pieces 6mm Diameter Drill Bits in The Package That Can Be Used for A Long Time And Make Replacements. Fine Workmanship: Well Crafted in Fine And Smoothly Appearance, This Diamond Drill Bit Ensures A Smoothly And Easy Use Experience, Choose with Confidence Specification: Item Type: Diamond Drill Bit Material: Alloy Steel, Emery Diameter: Approx. 6mm / 0.24in Package List: 5 x Diamond Drill Bit  Package List 5 x Diamond Drill Bit