Check the listing for details. 3pcs 1/2" Drive Impact Hex Bit Socket 4mm Metric CR-MO Steel Hexagonal Socket. Condition: New. Listed at 18.34 USD. 1. The hex socket is crafted from chrome molybdenum (Cr-Mo) steel, with rigorous heat treatment and forging processes to achieve hardness and toughness.2. Cr-Mo steel hex bit socket features a manganese phosphating surface treatment, enhancing its durability and resistance to wear and corrosion.3. This rugged, impact-grade tool is engineered to finish even the most stubborn fasteners, with a sturdy 1/2-inch driver shaft that guarantees a solid and secure connection. Fully suitable for both impact drivers and ratchet tools, it's a versatile staple for any toolkit. Moreover, these hex bit sockets excel at maneuvering components in tight spaces and seamlessly integrate with impact wrenches equipped with either a friction ring or detent pin block.4.