Snaps easily onto tee bar. Hanger comes complete with box mounting clip and 1/4-20 screw. Supports from acoustical tee bar as well as main structure with the use of a drop wire. Dual height feature permits 1-1/2" deep electrical box to be mounted fl ush with tile or off-set 3/4" for plaster ring. 512A is height adjustable up to 8" allowing you to install double deep boxes, speaker cases and emergency light fixtures above acoustical tee.