Designed to apply extremum torque, the 6-point of the TEKTON 3/8 in. x 9 mm rich Socket snugly fits the hex shape of fastener heads, so there 's no opportunity for slipping. To prevent helping off, it the regressive sides of fasteners rather than the corners. With an extra-deep broach, it over elongated, rib shafts to access nuts. click inside the drive end securely engage socket onto ratchets and extensions, so it wo n't fall off or stick on fasteners. Made from agio atomic number 24 vanadium steel, it 's from rust and corrosion by a long-wearing mirror atomic number 24 plated finish.