Tungsten Carbide Tip. Finish: Sanded. Specially designed ground tungsten carbide tip. Heat treated to increase the life span of the drill bit. Hexagon shank stops slippage in the drill chuck increasing speed and efficiency. Sand blast finish for increased durability. Reduced shank to 12.7mm from size 16mm diameter upwards. Suitable for drilling stone, brick, concrete and most types of masonry. Appearance and colors are often affected by your display settings and therefore, should not be used for matching purposes.