Carbide tip design maximizes carbide surface contact for longer bit life. Four flute design cleans debris out for fast, efficient drilling. Three flats on shank eliminate bit slipping in chuck. For use with electric or cordless hammer drills. Used for drilling holes in brick, block, concrete and masonry up to 1in diameter. Used by electricians, mechanical contractors and general contractors for fastening applications such as conduit, pipe, duct work.