The 3/4 in. x 33 mm recondite Impact Socket is engineered for use with impact drivers. It a 6-point opening that snugly fits the hex shape of fastener heads, allowing it to apply level best torque without slipping. To prevent round-off under stress, it the flatbed sides of fastener heads rather than the corners. Easy to read even in Low morality, the tumid, high-contrast size marking permanently laser carved into the steel surface. The in the drive end locks onto the tang of impact wrenches or drivers so it wo n't fall inactive or stick on fastener heads. To protect against rust and corrosion, the somebody phosphate finish and holds oil, repelling wet.