Peerless-AV CMJ490 Joist and Beam Ceiling Plate for Jumbo 2000Ideal for flat panel ceiling mounts or projector mounts, the CMJ490 Ceiling Plate Mount can be attached to a finished ceiling (wood joists) or wood beam using the four washer head wood screws included, or a structural ceiling (concrete) using concrete anchor accessory kit ACC244 (sold separately). Designed with aesthetics in mind all mounting hardware is neatly covered creating a finished appearance to any application. For 24" wood joist centers 1 1