AMRE5048 48" Extension Pole Tube for Universal Projector Ceiling Mount with internal cable managementAMRE5048 48 long extension tube with internal cable management (50mm diameter). This extension tube will allow you to lower your projector installation height by 48. These tubes can be combined with any of the same series (3,6,12,24 and 48) to allow for different lengths. The tube can help lower the projector to your desired height from the ceiling if you do not want to rely on screen height or lens shift keystone adjustments provided by your