Simple base plate / mount for a Raspbbery Pi Zero. Use four M2.5 threaded inserts (e.g. https://cnckitchen.store/products/gewindeeinsatz-threaded-insert-m2-5-standard-100-stk-pcs) for mounting.
Has 4 screw holes so you can screw the frame onto something else (wall, wood plate, whatever).
The author hasn't provided the model origin yet.