This 170-Piece Tool Set from Crescent contains almost any instrument a professional might need to turn, crank, screw, rotate or spin any manner of fastener, nicely contained in a hard-sided carrying case. This kit has everything needed for a handy beginner or discerning tradesworker to handle a diverse range of jobs. These strong, durable devices are constructed with Crestoloy® Alloy Steel and coated with a nickel chrome plated finish for long-lasting protection. Carefully selected assortment of Crescent® brand hand tools. Set contains all the tools needed for most applications, including 1/4", 3/8", and 1/2" quick-release ratcheting drives and standard/deep sockets in common SAE and metric sizes. This entire set meets the stringent new ANSI and ASME specifications and comes with a full satisfaction guarantee. Constructed with crestoloy® alloy steel for lasting durability. All tools contained in a sturdy folding plastic case for easy storage and transport. Backed by Crescent Limited Lifetime Guarantee. Sockets feature off-corner loading technology to reduce fastener rounding. 72-tooth ratchet requires only a 5-degree swing arc to turn a fastener. Mirror polish finish wipes clean easily. Ratchets have a large quick-release button for easy operation.