... Instruction:Shape:Round /square/flat/ angle/hexagonalSurface:Bright,blackFinish: Cold Drawn & PolishingStandard:GB,AISI,JIS ,etcGrade:300series,400seriesDIA: 5mm - 1000mmMaterialGrade:304 ... , construction and decoration , etc. with a high strength after cold-drawn , anti-stress corrosion , good surface. We are large and professional ...