Peerless-AV ACC640 Escutcheon RingModel ACC640 B Escutcheon Ring visually enhances suspended ceiling installations by covering hole where extension column passes through ceiling tile. Ring is hinged to open, wrap around extension column and snap into place to cover hole in ceiling tile. (Ring is not needed for installations using Suspended Ceiling Plates CMJ450 or CMJ453.) Covers hole where extension column passes through ceiling Hinged ring wraps around 1 1 2" schedule 40 extension