The CRESCENT mechanic's tool sets are professional tool sets contain tools for industrial jobs. They come with durable, full polish Crestoloy® alloy steel ratchets, drive tools, and sockets that are reliable and resist rust and wear. The blow-molded case has a designated spot for each tool. Teardrop Ratchet Head for Improved Access. Crestoloy® Alloy Steel for Strength and Durability. Tools Meet Stringent New ANSI and ASME Specifications and Come With a Full Satisfaction Guarantee. Large Quick Release Button for Easy Operation. Extra-Long Ratchet Handle for Better Access and More Torque.