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Laser Welded Diamond Stone Drill Bit Core Drill Bit for Diamond Tool. Widely used for drilling various stone materials under cooling water conditions, with faster drilling speed, long service life, high concentricity, and no tooth loss. Received National Invention Patent and 2014 Science and Technology Award. Total length of drill bit: 92mm for selection and customization. Connection buckle type: 5/8 "-11UNC or other options for selection and customization.