CMS0406W 4-6’ (121.9-182.8cm) Speed-Connect Adjustable Extension Column The CMS Speed-Connect Adjustable Extension Columns lower projector to desired height. Features: Provides height adjustment in 1" increments Knotched design for adjustment without disassembly Flow-through cable management with cable exit port Includes set screw for add stability Consists of 1.5" NPT column, threaded on both ends Use in combination with any Chief 1.5" NPT ceiling plate or other accessory