This Proto socket set is a valuable addition to any tool collection. With 36 pieces in both metric and SAE sizes, this set includes a variety of sockets perfect for any job. The set features a standard socket type with a 6 point drive type, and a chrome surface finish. Each socket in this set is sized at 1/4in. Drive and ranges from 1/8in. In SAE sizes and 4MM to 16MM in metric sizes. This set is perfect for automotive use and other hand tool applications. The lid on this case has spring pinned hinges that remove the top so you can put just the bottom in your toolbox drawer. This is a very nice feature. This is a great set of USA made sockets! Because I have a great surprise for this sale!