General description Professional Hole Cutter designed with a special brazed diamond for effective drilling in materials such as porcelain, glass, marble, ceramic, rock, and granite. This set includes a range of sizes to accommodate various drilling needs. Technical specifications Material: Carbon steel with diamond blade Sizes included: 6mm, 8mm, 10mm, 12mm, 16mm, 20mm, 22mm, 25mm, 30mm, 38mm, 50mm Durability: More than 8 times longer than standard hole saws Usage Ideal for drilling clean, precise holes and cutting perfect circles Ensure the drill bit does not run dry during use Monitor the temperature to prevent overheating, as the electroplated diamond coating may wear off if the tool gets too hot