Regularly furnished: 20 ga. box; 20 ga. tubular steel door with 18 ga. frame and a continuous steel hinge. All components are powder-coated with an electrostatically-applied, thermally-fused, recoatable white polyester finish. All glass door styles provided with clear tempered safety glass. Wall mounting: semi-recessed. Max.capacity: polyflex: 75 ft. and superflex: 50 ft. Inside box dimensions: KxLxM: 30 x 36 x 8 inches. Minimum wall opening required: 31 x 37 x 5¾ inches.