Crescent 170-piece mechanics tool set contains a carefully selected assortment of Crescent brand hand tools needed for most industrial, mechanical, and consumer applications. The set includes 1/4-inch, 3/8-inch, and 1/2-inch quick release ratcheting drives, with a wide selection of standard and deep sockets in the most common SAE and metric sizes. Included in the set are the following 3/8-inch drive tools: a 60-tooth quick-release ratchet drive, 2 extensions, a 3/8-inch to 1/4-inch adapter, 2 spark Plug sockets, 25 twelve point sockets and 12 six point deep sockets (SAE and metric). it also includes the following 1/2-inch drive tools: a 60-tooth quick-release ratchet drive, a 5-inch extension, 8 twelve-point sockets (SAE and metric). it also includes the following 1/4-inch drive tools: a 60-tooth quick-release ratchet drive, a 3-inch & 6-inch extension, 22 six-point sockets (SAE and metric) and 4 Torx bit sockets. Additionally there are 12 SAE and metric long-pattern combination wrenches, 2 pliers, 8-inch adjustable wrench, 2 screwdrivers, a magnetic bit driver with 45 driver bits, and 26 SAE and metric hex keys. All tools in this industrial quality tool set meet stringent new ANSI and ASME specifications and come with a full satisfaction guarantee.