... .3-75mm Finish: POLISH,ACID,HL,200# polishing, 400 # polish precision tube 321 Stainless steel is a production which not easy rust ... industry,heavy industry,daily necessities and the decoration industry. My company long-term supply stainless steel products, including stainless steel seamless ... ,316L,316LN,317,317L,309,309S,310,310S,430,409specificationRoundSquarerectangle precision tube 321