I have the original Raspberry Pi Model B. Later models had mounting holes in the PCB but mine does not. The mounting holes in the later models do not match the hole pattern of the Raspberry Pi 2,3,4 and 5. This plate grips the original Pi at the video and headphone jack and at the SD slot. The plate's holes line up with the hole pattern of modern cases.
The author marked this model as their own original creation.