This is a Gridfinity holder for a jewellery disk cutter which can be obtained from here: https://www.cooksongold.com/Jewellery-Tools/Disc-Cutter-Set-14-Sizes-From-3.0mm-To-16.0mm-prcode-999-772A
It holds the frame and the 14 individual punches.
The author remixed this model.
Added cutouts for disk cutter.