Description 1 IN. x 12 IN. Carbide Tipped Premium Percussion Drill Bit The DEWALT 1 in. x 12 in. Premium Percussion Drill Bit can be used to drill holes in brick, concrete, block and masonry. This drill bit features a rock carbide tip and a 4 flute design. The 4-Flute design helps clean debris out for fast, efficient drilling. Features: For use with electric or cordless hammer drills For drilling holes in brick, block, concrete and masonry up to 1 in. Diameter Used by general contractors, electricians, mechanical contractors and others for a wide variety of fastening applications such as commercial shutters, gutters, railings and duct work installation Rock carbide tip helps maximize carbide surface contact for longer bit life Used by general contractors, electricians, mechanical contractors, among others for a wide variety of fastening applications such as commercial shutters, gutters, railings and duct work installation