The PRG-EXA, PRG-EXB and PRG-EXC Adjustable Projector Mount Kits include an EXA-B-C series extension and PRG projector mount, offering versatile installation options in one simple package. They support most projectors up to 50 pounds and can be unobtrusively flush mounted on either the wall or ceiling (PRG-EXC is only ceiling). Or you can use the extensions for smooth, uninterrupted height and drop length adjustment to achieve ideal placement. The safety-catch mechanism will ensure that your projector won't slip off the extension and cause injury or damage. Even better, the included PRG Precision Gear Projector Mount with ImageLock allows pin-point image alignment by simply adjusting two knobs. And to round it all up, internal cord management keeps cables out of sight for a clean and clutter-free installation no matter how you choose to install and adjust it.