detail of a new customizes prefabricated metal carpentry with galvanized steel components and welded and bolted steel flanges

industry customizes metal building custom projects prefabrication construction bolt fastener nut prefabricated railing bannister carpentry metallic structural work components banister balustrade balcony rail galvanized steel zincplated galvanizing precast crossbeam roof beam architectural column site pillar activity iron structure engineering girder assembly calculating built rod buildings architecture technology detail new welded bolted flanges