The Powerbuilt 47-Piece Pro Tech 1/4-inch Drive SAE and Metric Socket Sets offer the look, feel, and performance hard-working Techs deserve. All sockets, socket accessories, and drive tools are constructed of high-quality Chrome Vanadium (CR-V) steel with a mirror-polished chrome-plated finish for the highest durability and corrosion resistance. Powerbuilt sockets are the heart of these sets. Their sleek chrome finish is enhanced with an easy-to-read size marking that is forged into the metal. The marking won't rust or wear off because it's forged into the socket wall. Powerbuilt sockets feature precision chamfered hex faces that make it easier to guide them onto fasteners. The exclusive Z-Drive hex pattern grabs and turns the flat surfaces of those fasteners to reduce round-off and slipping. The center holes are punched through to add a bit more clearance for taller nuts and bolts. The Set also includes a 72-tooth gear-to-gear sealed head ratchet, 3-inch, and 6-inch extension bars, and a universal joint. Powerbuilt Professional Technician socket sets are built to meet or exceed ANSI specifications.