【Professional Diamond Hole Opener】Made of selected high-strength carbon steel and equipped with a diamond-coated drill bit, offering excellent cutting capacity, rust resistance, durability, high torque, and a long service life. 【High-Quality Hole Drilling】The diamond coating increases drilling speed and makes the drill bit cleaner. The pointed design reduces resistance and makes drilling more efficient, helping you accurately create smooth, round holes. A round chip hole on the side keeps the drill bit clean at all times. 【Ideal For】Specifically designed for drilling porcelain, glass, marble, ceramics, rock, granite, and more. 【Usage Tips】First, cut a 45° angle, create a groove by positioning the drill bit, then slowly raise the hole opener and drill at a steady speed. In addition, keep the drill bit wet while drilling to prevent overheating. Diamond Drill Bit This diamond drill bit allows you to remove a complete circle from glass, tiles, marble, granite, ceramic, or other materials.