Check the listing for details. 4 Point Square Socket 1/2" Drive 8mm Metric CR-MO Square Impact Wheel Socket. Condition: New. Listed at 9.95 USD. 4-point drive socket is made of sturdy CR-MO alloy steel forging, which has high tensile strength and wear resistance, effectively absorbs impact, is not easy to deform or damage, and is suitable for working environments with high torque. The blackening surface is high-temperature phosphating, helping to prevent rust and corrosion, thereby extending the tool's lifespan.The port of the impact socket adopts a 4-point square structure, which can better fit the square head of the screw or nut, providing a stronger grip when used, preventing the fastener from becoming round, and is not easy to slip. The anti-drop hole design of the base can help the socket be fixed on the tang of the pneumatic wrench or driver to prevent the pin from falling off, making it safer to use.