Quality Selection: These diamond drill bits are made of high-quality 45 steel for durable performance. Featuring a nickel-plated body to resist corrosion, ensuring a long service life. Large chip holes allow smooth and accurate drilling. Smoothly Cutting: A thick layer of diamond dust coating on the tip provides superior cutting strength, delivering high precision and clean, smooth cuts without chipping. Reduced drill speed, low pressure, and ample water lubrication significantly extend bit life. Multiple Applications: Suitable for drilling 130mm diameter holes in glass, tiles, granite, ceramic, porcelain tile, slate, marble, light stone, fiberglass, bottles, jars, and blocks. Not intended for use on concrete or for depths exceeding approximately 1/2 inch. Specifications: Finish: Nickel-plated Color: Silver Material: Diamond and 45 steel Size: 130mm Package Contents: 1 x Diamond Drill Bit How to Use: 1. Insert the glass drill bit into the drill. 2. Begin at a 45-degree angle slowly, as centering may be difficult. 3. Create a small starting mark to locate the center, then proceed vertically. 4. Maintain controlled speed and always use water during cutting. Attention: 1. Always use water as lubrication when operating the diamond drill bit to prevent overheating and damage. 2. Do not use on metal materials. 3. Not suitable for concrete or drilling depths beyond approximately 1/2 inch. 4. Keep rotational speed between 800–1000 RPM. Low drill pressure and consistent water cooling improve durability. Package includes only the items listed. Other accessories are not included. Note: Display lighting may cause slight color variations between the image and actual product. Measurement tolerance is ±1–3 cm.