Screw holes are 2 3/4" apart. They will NOT thread into a standard J-Box and will NOT thread into a standard slotted J-Box bar. You will need to purchase a universal crossbar with threaded holes 2" to 3.4" apart. Or just use one screw. They are small and light, so only one screw can be used! They get a few stars for misleading advertising. Dimmer Nice appearance.
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