... in construction engineering.export: Australia, Malaysia, Indonesia,Italy.... galvanized steel frame,steel ceiling and drywall systems,Used in construction engineering.export: Australia ... Thailand, Philippines, dubai, Brazil, Colombia, Bolivia, Italy, Chile, France...steel ceiling:Main channel:25x21x0.75mm,38x12x0.8mm,36x16x0.5mm,28x20x0 ... ,30x13x15mm,30x16x15mm,thinkness 0.4-0.5mm building steel frame