Steel structure(rigid steel frame structure,light steel structure,famous steel structures) Standard: AISI, ASTM, BS, DIN, GB, Steel structure(rigid steel frame structure,light steel structure,famous steel structures)Quick DetailsStandard: AISI, ASTM ... DeliveryPackaging Detail:as customer's requestDelivery Detail:discuss individuallySpecifications1) two decades' experience 2) factory direct sale 3) ...