Features and Benefits: Manufactured from chrome vanadium steel Heat treated for strength and durability High-polish chrome finish resists against rust and corrosion Marked with part number and size for easy tool identification Standard 6-point design for use with 3/4 drive tools Made of heat-treated chrome vanadium steel for durability. Our sockets feature high-polish chrome finish which protects the tools from the harsh working environments found in today s workplace. Lifetime warranty. All sockets are marked with part number and size for ease of use.