steel frame,steel ceiling and drywall systems,Used in construction engineering.export: Australia, Malaysia, Indonesia,Italy.... galvanized ... steel frame,steel ceiling and drywall systems,Used in construction engineering.export: Australia, Malaysia, Indonesia, Thailand, ... bead:30x6x15mm,30x10x15mm,30x13x15mm,30x16x15mm,thinkness 0.4-0.5mm building steel frame