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 hammerdrills.Used for drilling holes in brick, block, concrete and masonry up to 1" diameter. Used by electricians, mechanical contractors and general contractors for fastening applications such as conduit, pipe, duct work, etc.