Crescent 121-piece professional 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" and 3/8" drive quick-release ratchets 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" drive tools: a 72-tooth quick-release ratchet drive, 3" extension, 23 12-point sockets, and 12 6-point deep sockets (SAE and metric). Also includes the following 1/4" drive tools: a 72-tooth quick-release ratchet drive, a 1/4" bit adapter, 23 6-point standard sockets, and 12 6-point deep sockets (SAE and metric). An acetate magnetic bit driver with 10 driver bits, 12 hex nut setter bits (SAE and metric), and 24 hex keys with tilt-out caddy in both SAE and metric sizes are provided as well. All tools in this industrial quality tool set meet stringent new ANSI and ASME specifications and come with a full satisfaction guarantee.