... :1000-12000mm Surface:bright , black , pickeled & bright 309 Round Stainless Steel Bar (stainless steel round bar, angle bar , flat bar , channel bar , hexagon ... 309,310,310S,316,316L,321,410,420,430,etc.2.Diameter:3mm-400mm.3.Surface:bright , black , pickeled ... foods, electron , petroleum , construction and decoration , etc. with a high strength after cold-drawn , anti-stress corrosion , good surface ...