Features and Benefits: Heat-treated chrome vanadium steel for durability High polish chrome finish protects the tools from harsh working environments found in today s workplace Socket is marked with part number and size for easy tool identification For use with 1/2 drive tools 6-Point deep socket KTI impact sockets are forged from the finest chrome-moly steel which provides the best strength and durability. Sockets are designed and crafted to take on the toughest jobs with solid performance. Lifetime warranty. All sockets are marked with part number and size for ease of use.