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Laser Welded Diamond with Protective Teeth Stone Drill Bit Core Drill Bit. Widely used for drilling granite and marble, it has the advantages of faster drilling, longer lifespan, high concentricity, and no tooth loss. It can be drilled without cooling water. The total length of the drill bit is 92 mm and other options are available for customization. Connection buckle type: 5/8 "-11UNC or other options available for customization.