1. 【Wide range of applications】 Ceramic tile drills are suitable for all electric drills. Widely used in glass, ceramic tile, ceramics, floor tile, jade, marble, rosary, granite, etc. Not suitable for tempered glass, concrete or concrete more than 1/2 deep. The advantages of tile drills are easy positioning, low cutting resistance, shaking and ideal opening effects. 2. 【High quality】 The tip of the diamond drill is made of nickel-plated high-speed steel and has a diamond coating of 80-100 grit. It has good wear resistance, high hardness, sharpness, high quality and long service life. 3. 【Fast Cutting】: The diamond hole saw blade is coated, sharp, high precision, smooth cutting, no creasing, easy to cut into a clean and accurate hole, the center guide hole and side holes help remove waste. 4. 【Use】 Hole saw glass drill tool set is used with all electric drills and impact drills. Please keep the speed at 800-1000 per minute. Add water to keep the drill cool. Dry drilling is strictly prohibited. 5. 【Packing】: You will get 15 tile hole saws, the size is 3mm, the quantity and size can meet your daily needs.