80mm Brazed Core Diamond Hole Saw Drill Bit Hollow Hole Cutter for Glass Porcelain Tile Marble Ceramic Granite

General description Professional diamond hole opener made of high-strength carbon steel with a diamond-coated drill bit, offering excellent cutting ability, rust-proof durability, high torque, and a long service life. Ideal for drilling through porcelain, glass, marble, ceramic, rock, and granite. Technical specifications Diameter: 80mm Material: High-strength carbon steel with diamond coating Usage Start by cutting a 45° angle to create a positioning crescent groove. Slowly erect the hole opener and drill at a uniform speed. Keep the bit moist while drilling to prevent overheating.