Bracket With Rod For Ceiling Attachment. Can be attached directly by screws or rods with a maximum diameter of 1/2". Before mounting the bracket it is advisable to standardize the length of both the rods and screws. Fix the bracket between nuts allowing the screw on the inside of bracket to protrude about 0.59". When fixture is completed, it is then possible to regulate perfect rail levelness by adjusting the nuts that fasten the brackets.