SuperBlue hard body electrical box. Direct substitute for fiberglass boxes. SuperBlue box will not break when hit with a hammer. The box has an L bracket which combines the mounting feature of a metal bracket plus the angled nails for quick mounting. Designed and UL (Underwriter's Laboratories) approved to support a ceiling fan of up to 35 Lb. and a light fixture of 50 Lb. Comes complete with a snap-on cover to protect wires from ceiling paint or drywall during construction.