This is a rackmount bracket for Intel NUC mini PCs. It mounts to the left hand side of a standard 19" rack.
It was originally designed for and tested with a NUC6i5SYH. It will likely also fit other Intel NUC models with the mounting screw holes in the same location.
Two M3 screws are required to hold the NUC in position.
The author marked this model as their own original creation.