This 10-piece set offers a useful assortment of 6-point metric deep well 1/4" drive sockets. The chrome finish is enhanced with an easy-to-read size marking that is forged into the metal. Because it's forged into the socket wall, the marking won't rust or wear off. Inside Powerbuilt sockets, you'll find precision chamfered hex faces that make it easier to guide them onto fasteners. And the exclusive Z-Drive 6-point hex pattern grabs and turns the flat surfaces of those fasteners to reduce round-off and slipping.