Peerless-AV ACC845 Anti-Vibration Ceiling PlateThe Anti Vibration Ceiling Plate for Unistrut installations reduces unwanted vibrations from ceiling structures that may cause internal damage or interference with the projected image. Unit has 1 1 2" 11. 5 NPT fitting for attachment of extension column Features two cord management access holes Works with Unistrut ceiling mounted applications Reduces vibrations that may cause internal damage to equipment and or cause display image to vibrate Peerless