IVY Classic Premium Carbide Masonry Drill Bits have a 1/4-inch hex shank, for quick change, and are designed for rotary and percussion hammer drilling through block, brick, stone, concrete and marble. These bits are constructed of tungsten carbide and have been induction hardened, ensuring their straightness and strength, engineered with wide flutes for fast dust removal and feature a black-oxide finish. IVY Classic Industries is dedicated to producing a comprehensive, quality line of power tool accessories and hand tools.