The Powerbuilt 47 Piece 3/8" Drive SAE and Metric Mechanic's Tool Socket Set is a great starter set for pros and serious home mechanics. It offers great coverage of the most popular 3/8 inch drive sockets in shallow and deep styles in both SAE and metric sizes. Strong as well as beautiful, Powerbuilt sockets are constructed of premium chrome vanadium steel. They feature jumbo high-visibility size markings that are forged right into each socket sidewall so they'll never fade or wear off. Built of strong chrome vanadium steel with a beautiful mirror finish, the 72-tooth ratchet features a stylish full-length spiral-machined handle that keeps your grip from slipping while you work. The fully sealed head keeps lubricant in and debris out for longer service intervals. Dependable Powerbuilt tools meet or exceed ANSI standards and have a lifetime warranty, all at affordable prices.