... structure, steel rafter, steel column, steel tie beam,bridging rod, corrugated roof sheet, sandwich panel,C or Z purlin, metal gutter ... cap, bolt and nut ...Protective coatings, shot blasting and painting, hot dipped galvanizing can be applied to your specifications. Openex is ... the world. steel structure,prefabricated warehouse,steel frame,steel factory,hot dip galvanized steel structure