Regularly furnished: 20 ga. box; 20 ga. tubular steel door with 18 ga. frame and a continuous steel hinge (brass pin). All components are powder-coated with an electrostatically-applied, thermally-fused, recoatable white polyester finish. Clear, vacuum-formed, polycarbonate bubble. Wall mounting: trimless. Max.capacity: polyflex: 75 ft. and superflex: 50 ft. Inside box dimensions: KxLxM: 30 x 30 x 4¼ inches. Minimum wall opening required: 31 x 31 x 5½ inches.