... hollow section size: 28*28, 38*38 thickness: 0.8-1.2mm material: q195-q235 finishi: black annealed Steel window hollow ... High pressure steel prof...tolernace: normal standard toleranceShape: round,square,rectangularsurface: pickled, acid, polished, black,ectcertificate: ISO, ... decorations, railroad vehicles.Some seamless stainless steel pipe/tube which has excellent corrosion resistant, mechanical ...