... you needed.Exhibition hall included the main structure( steel beam/girder, steel column/pillar), the secondary structure( roof and ... type, etc. b. Single color corrugated steel sheet( Steel Material: Aluminum- Zinc sheet;galvanize steel sheet ect):They have different thickness( 0 ... )6. We also have so many accessories, for example, steel bracket, bolts, self-taping screw, rivet, inter and outer cullis ...