1.stainless steel tube used for stair railings, windows guards, Doors, handrailings ect 2.High roundness and high bright polish From the nature, To the excellence NameStainless Steel Weled TubePositionDeck Railings / Handrails, Porch Railings / Handrails,Stair Railings / HandrailsStandardASTM A554, A249, A269 and A270Material Grade201: Ni 0.8%~1%202: Ni 3.5%~4.5%304: Ni 8%, Cr 18%316: Ni 10%, Cr ...