18" (457 mm) Speed-Connect Fixed Extension Column, White The CMS Speed-Connect Fixed Extension Columns lower projectors to the desired height. Features: Aluminum extension column features easy installation and maximum strength Flow-through cable management with cable exit port Consists of 1.5" NPT column, threaded on both ends Use in combination with any Chief 1.5" NPT ceiling plate or other accessory Specifications: Length:18" (457.2 mm) Color: White (also available in Black and Silver) Weight Capacity: 500 lbs (226.8 kg)