From Klein Tools, Keystone-Tip Screwdrivers have professional extra-quality features that have made the Klein name famous for hand tools features that assure greater convenience, comfort and efficiency in use, plus exceptional strength and durability. Klein Screwdrivers are made of the highest quality tempered steel, carefully heat-treated for maximum strength. Shafts will not bond or twist in normal use. Shafts have integral flanges that provide an extra-strong, torque-proof anchor in the handle. Strong, durable black tips are precision forged and ground with square edges to fit screw openings securely.