Threaded on both ends, the Chief CMS-0709 is a 7 to 9' adjustable extension column that can be used with any 1.5" NPT accessory to lower a projector or flat-panel display to a desired height. It includes a continuously adjustable notch for length changes (1" increments) without disassembly, aluminum construction for fast and easy installation, and flow-through cable management with an integrated port for routing cables. It supports up to 500 lb.