Copper brazed, tungsten carbide tip and ground centre point with sand-blasted finish. Single flute for efficient waste removal and quick clean drill hole. For use on concrete, masonry, lightweight block and stone. Sizes: 12, 16 and 24mm. Copper brazed, tungsten carbide tip and ground centre point with sand-blasted finish. Single flute for efficient waste removal and quick clean drill hole. For use on concrete, masonry, lightweight block and stone. Sizes: 12, 16 and 24mm.