I wanted to have my Allen keys available at all times, and when they annoyed me on my desk, I moved them to the wall.
This model is only the holder. In addition to that part, you will also need two M2.5 Skadis-T-Nuts from the great system devised by @6d6178 as well as two M2.5 hex nuts and two M2.5x12 screws.
In case you want to create something similar, I attached the required FreeCAD file as well as the scan of the Bondhus thingie I traced out in order to create the specifically curved cutout in this model.
If you like this, please post a make and comment - I am a bit starved for attention, you know. :)
The author marked this model as their own original creation.