The black PRG Precision Gear Projector Mount for Projectors Weighing Up to 50 lb from Peerless Industries is a ceiling mount for digital projectors. It features a precision gear mechanism, which is used to ensure accurate image alignment. Dual adjustment knobs control this mechanism, and integrated cable management helps to keep cables out of your way. The mount features a quick release mechanism, allowing you to easily unmount the projector for maintenance. The quick release is designed so that the projector will retain its registration, eliminating the need to realign the unit after service.