General description Professional Diamond Hole Saw made of high-strength carbon steel with a diamond-coated drill bit, offering excellent cutting ability, rustproof durability, high torque, and long life. Ideal for drilling through porcelain, glass, marble, ceramic, rock, and granite. Technical specifications Diameter: 90mm Material: High-strength carbon steel with diamond coating Installation Cut a 45° bevel to start Open the positioning crescent groove Clamp the arbor in the correct position Take necessary protective measures when working with wood Usage Drill at a uniform speed Keep the bit moist while drilling to avoid overheating The side hole allows for round chips to keep the bit clean