512A is height adjustable up to 8" allowing you to install double deep boxes, speaker cases and emergency light fixtures above acoustical tee. Dual height feature permits 1-1/2" deep electrical box to be mounted flush with tile or off-set 3/4" for plaster ring. Hanger comes complete with box mounting clip and 1/4-20 screw. Not permitted for paddle fans. Not to exceed 20 lbs. without independent wire support to CHB. Snaps easily onto tee bar. Supports from acoustical tee bar as well as main structure with the use of a drop wire.