General description Diamond Coated Drill Bit Set includes 150 pieces of high-quality diamond hole saws designed for precise and smooth cutting through various materials such as tile, glass, ceramic, porcelain, and marble. This set is perfect for both professional and DIY projects, ensuring clean holes without broken edges. Technical specifications Cutting hole diameter: 6 mm / 0.23 inches Length: 5 cm / 2.5 inches Material: Diamond + Metal Color: Silver Installation Mark the beginning of the hole with a pen. Keep the area wet with coolant during drilling. Start drilling at a 45-degree angle, then adjust to a vertical position as the hole forms. Use minimal pressure and low-speed drilling. Slow down speed for the exit hole or drill from the other side to avoid breakthrough. Usage Ideal for wet cutting of tiles, glass, aquariums, marble, ceramic, porcelain, bottles, and quartz sinks. Ensure to keep adding water while drilling to prevent overheating. Diamond coating maximizes performance