Topaz Fan Support Boxes with Brace are made from galvanized steel. These boxes come with a protective metal cover to eliminate debris entry and damage to wire. Features include side knock outs, energy saving round design, easy-to-use slide select feature for choosing #8 and #10 screw holes. Holds fixtures with a weight up to 150 lbs. on 16” centers, 90 lbs. on 24” centers and ceiling fans up to 70 lbs. UL listed and ROHS compliant.