I keep my metric and stainless hardware, machine screws, and odd ball fasteners in plastic totes (Plano boxes) to keep them separate from all the SAE hardware. The totes have never really had a home and they move from self to surface in the shop and either are in the way or I can’t find the one I need when I need it. Over the New Year’s break from my J-O-B, I screwed together a 3/4” plywood organizer so the totes would have a forever home. The wood was left over from 5+ other projects, so basically scrap, and the screws were taken out of a fence I pulled down last summer. Really happy that this project cost me little to nothing, that I was able to reuse the material, and most importantly I am giddy to have a specific place to organize my organizers.
The box is held to the wall with a French Cleat. I use them to hang all my cabinet uppers and for mounting heavy stuff to the wall in both the shop and house. They hold really well and it is easy to reconfigure with them.