From the Manufacturer

The KD Tools 7-Piece 3/8-Inch Drive SAE Long Ball Hex Bit Socket Set includes 1/8-inch, 5/32-inch, 3/16-inch, 7/32-inch, 1/4-inch, 5/16-inch and 3/8-inch bit sockets. The sockets have heat-treated bases for maximum durability and utilize a patented bit holding system that forces the bit surface to the opposing side for maximum retention and strength. These tools are packaged in an impact-resistant slide rail system for easy socket storage. KD Tools backs them with a lifetime warranty.

What's in the Box
1/8-inch, 5/32-inch, 3/16-inch, 7/32-inch, 1/4-inch, 5/16-inch, and 3/8-inch 3/8-inch drive bit sockets with storage rail.