This is a set of 3 plastic socket storage racks. The sets are metric and hold 1/4, 3/8 and 1/2 inch drive sockets. I used these racks to organize socket sets in my business and no longer need them. Other than that, these racks have never been used in a shop / garage and are in near new condition. Organizer racks make your tool box or shed a much more orderly setting, make your sockets easier to find and even to move around with.