Summary

These are holders to store 3/8 and 1/2 sockets on a wall (1/4 version coming soon). Since it's and individual design you can arrange several of them as it's more convenient for you. They are designed for a #6 x 1-1/4 (or longer) screw.

The fit it is a bit tight, so you might need to put a bit of force to remove the socket the first few times. Then it's fine.