This is a bracket to hold a Raspberry Pi (Model 2/3/3+) and a 2.5 inch notebook hard drive or SSD, and mount the whole assembly to the back of a Mysweety 1610 CNC engraver, where it can drive the engraver and serve CNCjs to my LAN. It's also designed to leave enough room to add a board to the Pi's GPIO header, or just allow lots of airflow.