I purchased a Craftsman tool set and needed these racks to put the sockets in order. I have purchased these in the past and they have always worked out very well.
The metal socket clips don't move smoothly back and forth on the metal rails. They take a little more time to put the sockets back. They don't keep the sockets in place 100% because the clips are not square drive lugs, and they're out of shape easliy. I think I will need to buy new metal clips from time to time. This means that the cost will be much more in the long run, compared to the plastic version. If I could go back, I would get the plastic socket racks with plastic studs.