I use 15mm DIN rail a lot for putting up tools. These holders are designed to fit Wera screwdrivers, but I've included a link to my original CAD in OnShape and you can customize the design for your own tools.
If you make new tools for this, please tag your creation with tag din15toolclip
I also have a video explaining how the part is designed … see below.
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The author marked this model as their own original creation.