1-Inch Drive by 21mm 6-Point Impact Socket CR-V Steel 80mm Length Standard Metric Sizes

* Made of chrome vanadium steel construction for strength and durability. * With black phosphate finish to protect against rust and corrosion. * Has 6-point opening that snugly fits the hex shape of fastener heads allowing it to apply maximum torque without slipping. * To prevent round-off under stress it grips the flat sides of fastener heads rather than the corners. * The through-hole in the drive end locks onto the tang of impact wrenches or drivers so it won t fall off or stick on fastener heads. * Widely used in DIY hand-making household maintenance and most general repairs.