CMS-006009 CMS Speed-Connect Adjustable Extension Columns can be used with any 1 1/2" NPT accessory to lower projector to desired height. Provides up to 2' range of height adjustment in 1" increments depending on model (6" to 12' lengths). Includes set screw for added rigidity. Notched adjustment design for length changes without disassembly Aluminum construction for easier installation – also saves on shipping costs SPECIFICATIONS Length: 6 - 9" (152.4 - 228.6 mm) Color: Black Weight Capacity: 500 lbs. (186.62 kg)