Feature:1. Efficient elliptical chip hole design is more conducive to the discharge of chips, and bring small cutting resistance2. Adopt good quality material, possess of sharpness tip, long‑lasting wear resistance3. dry drill bit is suitable for marble, concrete, artificial stone, etc., very versatile4. The product adopt brazing process, possess small deformation, smooth and beautiful joints5. Dry drill bit have stable structure, excellent performance and long service lifeSpecification:Item Type: Dry Drill BitMaterial: DiamondProcess: BrazingOpen Hole Diameter: Approx. 8mm / 0.3inColour: Black Package List:1 x Dry Drill Bit