... 8-1.2mm material: q195-q235 finishi: black annealed Steel window hollow sectionsize: 28*28, 38*38thickness: 0.8-1. ... pickled, acid, polished, black,ectcertificate: ISO, BV, API, CSC,DNV,ectnormal length: 1000mm,3000mm,6000mmprice: factory priceservice: OEM/ODMtechnical: Seamless &weldedType: stainless ... supplied with shipment, Third Part Inspection is acceptable. Steel window hollow section