This is a Premier PP-FCMA False Ceiling Adapter.
This adapter allows you to mount projectors to the support system of your suspended/false ceiling. It fits in the T-bar metal framing system, replacing one standard 24"x24" ceiling tile. It provides for some manual horizontal adjustment, so you can achieve an ideal focal point. It will support up to 50 lbs. when properly installed.
Premier Mounts PP-FCMA False Ceiling Adapter