Peerless-AV ACC570 Round LCD/Projector Ceiling Plate (Black)The ACC570 Round Ceiling Plate is compatible with all Peerless AV projector mounts and many Peerless AV TV mounts (see maximum load warning) with 1 1 2 11. 5NPT fittings. Unit has 1 1 2" 11. 5 NPT fitting for attachment of extension column Features cord management access hole Mounts to wood joist or structural ceiling Peerless AV ACC570 Specs Construction Cold Rolled Steel Dimensions Shipping Dimensions (LxWxH): 12. 8 x 9. 5 x 2. 5" (32. 4 x 24. 1 x