Forged with chromium molybdenum steel material, surface heat treatment, high strength and durability. To prevent rust and corrosion, the black phosphate finish absorbs and retains oil, repelling moisture. 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.
