... AISI 303, 304, 304L,310,310S,316,316L,321 stainless steel angle bar,we can polish surface for you,and have ... rolled into black surface--pickling into acid liquid--polished by automatically machine--cutting into pieces--checking quality--package4.surface:black, ... stocks,diameter from 10mm*10mm*2mm-300mm*300mm*20mm6. usage:stainless steel angle bar is widely used in chemical, shipping,architecture, ...