For masonry, stone, brick, tiles, and concrete. This DeWalt Extreme Masonry Drill Bit lasts up to 2x longer and delivers up to 50% more holes per charge than a standard masonry bit. It features a unique Carbide Grade for maximum durability and a hardened steel body for strength and reduced bit breakage. DeWalt Extreme Masonry Drill Bit 5.5 x 85mm Steel.