This is a mount for the 5" Elecrow Raspberry Pi Screen with the Raspberry Pi attached to the back.
The Screen comes with long and short standoffs that serves as its stand. It has slots that fit the long standoffs then you can fit the short standoffs' screws through the holes at the end of the slots to lock it in place. (You could probably also use 2.5 screws but I haven't tested that.)
Screen: https://smile.amazon.com/dp/B08343QX67?psc=1&ref=ppx_yo2ov_dt_b_product_details
Note: I actually messed up and forgot to account for the ethernet port in my first attempt. I had to solder through the side of the slot to make room for it. I fixed it in v1.1 but I haven't actually printed it to test it out properly yet.
The author marked this model as their own original creation.