1" Drive by 21mm Square Impact Socket, 80mm Length CR-MO, Standard Metric Sizes

* Made of chrome-moly steel construction for 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.Specifications:* Socket Size: 21mm* Drive Size: 1-inch* Total Length: 80mm / 3.15-inch* Material: Chrome-Molybdenum Steel (CR-MO)* Finish: Black Phosphate* Color: BlackPackage Content:* 1 x Square Impact Sockets

• 【Size】 1" square drive, 21mm square socket, 80mm (3.15") total length.
• 【CR-MO Steel】Forged with chrome-molybdenum steel provides excellent durability and strength with every impact movement; black phosphate finish for extra protection against rust and corrosion.
• 【Design】Radiused corners prevent fastener wear and increase torque on fasteners by placing force on fastener's flat sides, rather than fastener corners.
• 【Pin Hole】Individual pinhole base design adds extra security by placing in a locking pin for stability when exerting strong torque motion.
• 【Widely Use】For disassembly and tightening of hexagon head bolts and nuts, especially suitable for requiring large torque and narrow space. The product has no insulation properties and is not suitable for electrical environments.