Product details:

• Speed-Connect CMS-0406 Adjustable Extension Column can be used with any 1 1/2" NPT accessory to lower projector to desired height.

Features:Provides height adjustment in 1" increments, Notched 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
Assembled Product Dimensions (L x W x H):45.00 x 6.00 x 6.00 Inches