Stanley drill bits are designed to resist the impacts and fast drilling on concrete. The flute design removes the debris from the hole contribution for longer drill bit life. The hardened steel construction of the drill bit ensures exceptional strength, allowing it to withstand the toughest drilling applications. Whether you are working on soft or hard surfaces, its reinforced carbide tip provides maximum durability and longevity, ensuring consistent performance throughout projects. Features benefits bull for drilling into house bricks and masonry bull shank diameter of drill bits 10 13mm is reduced to 9.5mm bull diameters larger than 13mm shank is reduced to 12.7mm bull for use with corded and cordless hammer drills bull cold rolled shank guarantees total straightness of the shank specifications bull diameter 20mm bull drill length 400mm bull working length 230mm bull head type 2 cutter bull shank round