Features Glossy Surface: The surface of the hole opener bit is glossy and free of burrs, and the opening is round without gaps. Large Opening: The design of the cut out is larger, which greatly reduces the resistance when opening the hole. Diamond Sand: Added diamond sand material, with high hardness, wear resistance, and fast drilling speed. Round Shank: The round shank design makes it suitable for use on various electric tools and has strong practicability. Applicable Materials: The hole opener can be used for drilling glass, ceramic tiles, stone, floor tiles, marble and other materials. Specification: Item Type: Diamond Drill Bit Material: Diamond Sand Hole Diameter: Approx. 20mm / 0.8in Handle Type: Round handle Uses: Can be used for glass, ceramic tiles, stone, floor tiles, marble, etc. Package List: 2 x Diamond Drill Bits Package List 2 x Diamond Drill Bits