Diamond Drill Bit: Made of carbon steel with diamond coating for porcelain, glass, marble, ceramics, stone, and granite, etc. High-Quality Hole Drilling: Thick blade with brazed design for long life, ideal for drilling clean and precise holes and cutting perfect circles. Long Lifespan: Heavy-duty hole saws provide superior performance, durability is more than 8 times higher than other common diamond hole saws. Warning: Start drilling at a 45-degree angle and drill vertically once the crescent-shaped edge is cut to prevent the hole saw from slipping. Never let your drill run dry and use water to keep it wet and cool. How We Differ: We strive to make the best products to inspire our customers to live a more comfortable and safer lifestyle. We have a professional product monitoring team that focuses on every detail that is important to you. Product Description Specifications: Material: Carbon steel. Shank diameter: 10 mm. Diamond coating: 1.5 mm. Features: This diamond drill removes a complete circle from glass, tile, marble, granite, ceramic, or other materials. Warning: Always use water as lubrication, otherwise the diamond drill will burn out. Can be used with a standard electric drill. Make a semi-circular mark at a 45° angle and then hold the drill straight. Reduced drilling speed, low drilling pressure, and increased use of water to keep the hole saws cool will significantly extend the drill's lifespan. Note: All data are manual measurements, please allow an error of 1-3 cm, due to the difference in light and display, there will be a certain color difference, depending on the actual item received. Delivery quantity: (as shown in the main picture)