The CMS Speed-Connect Adjustable Extension Columns lower projector to desired height. Features: Provides height adjustment in 1" increments 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. Specifications: Length: 9 - 12" (228.6 - 304.8 mm) Color: Black (also available in Silver or White) Weight Capacity: 500 lbs. (226.8 kg)