Guys these are where it's at and you can get them in different colors so you can tell metric and SAE apart as well as specialty sockets. A company named Olsa makes them too but I like the Ares ones. At least for me cause I use pegboard. I'm about to buy a bunch more. The rails are metal, I believe aluminum. I bought these for my e sockets and my torque sockets. My Allen sockets already came with their own holders. Check out the pic. Also the shop dog.
https://www.amazon.com/dp/B01K7TBPD4/ref=cm_sw_r_cp_apa_i_wBCcFbQ5GQEAW
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I really like these. I was looking at the Olsa version but I only see red whereas these offer a couple of colors. The end caps come off so it should be easy to cut to shorter lengths. I may order a couple of these to see how they’d work.

