SONIC's advanced flute design clears debris faster, keeping the cutting tip cooler, extending drill life. Industrial tungsten carbide cutting tip resists wear and breakage for maximum durability. Fully ground, heat treated body handles the shock and stress of cutting concrete, stone, tile, granite and other masonry materials. Ground 3-flat shank grips tightly into drill chucks eliminating slippage, available on 3/8" plus diameters.