This is a single-piece mount for the Raspberry Pi 4 Geekworm Armour Case, which allows it to be mounted under a desk or on the wall. Although the case doesn't come with anchor holes like many cases do, this one holds it very securely. The screw holes are accessible with the RP4 in the mount and it can be removed when the mount is not on the wall/desk, but it would be challenging to get it in place. There is a small opening inside the mount for airflow/cooling under the pi, which should run cooler than just sitting on a desk.