CMS Speed-Connect Adjustable Extension Columns lower projector to desired height. Provides up to 2&#39; range of height adjustment in 1&quot; increments depending on model (6&quot; to 12&#39; lengths available). Includes set screw for add stability. Consists of 1 1/2&quot; NPT column threaded on both ends. Use in combination with any Chief 1 1/2&quot; NPT ceiling plate or other accessory. &lt;br /&gt;Designed to adjust length without requiring disassembly.&lt;br /&gt;Aluminum construction for easier installation  also saves on shipping costs.&lt;br /&gt;&lt;br /&gt;* NOTE: Bracket adds 6 lbs/2.7 kg and .94&quot;/24 mm depth to installation. Be sure additional weight does not extend wall or ceiling mount weight capacity.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Features:&lt;/b&gt;&lt;br /&gt;-The revolutionary notched design allows for lightning-fast height adjustments &lt;br /&gt;-Flow-through cable management with cable exit port &lt;br /&gt;-All-aluminum construction &lt;br /&gt;-Available in black white and silver