Made of chrome vanadium steel for strength and durability. With black phosphate finish, prevents rust and corrosion. Has a 6-point opening, it can fit tightly to the hexagon of the fastener head so that the maximum torque can be applied without slipping. To prevent round-off under stress, it grips the flat sides of the fastener head 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: 24mmDrive Size: 1/2-inchTotal Length: 41mm / 1.61-inchMaterial: Chrome Vanadium Steel (CR-V)Finish: Black PhosphateColor: BlackPackage Content:1 x 6-Point Impact Socket