Lightweight, noncorrosive, and nonconductive, rigid, nonmetallic wiring box combines features of hard shell thermoset box and thermoplastic PVC style box. Molded of specially formulated, strong thermoplastic material, will not crack or break, even in extreme environments. Resists flexing and holds shape even under the worst conditions. Provides large wirefill capacity, and comes with molded-in nailing flanges and clamps to make installation faster. Listed for fixture support up to 50 lb. Hanger bar adjusts from 11-1/2 in to 18-1/2 in UL Listed.