Use the Chief CMS009 9" Speed-Connect Fixed Extension Column (Black) to lower your projector or flat panel display an additional 9" (22.8cm) from the ceiling. This column also provides flow-through cable management with a cable exit port for a clean installation. Use in combination with any 1.5" NPT ceiling plate or other accessory. It consists of 1.5" NPT column threaded on both ends. Weight capacity is 500 lbs.