... , 17mm, 18mm, 19.1mm, 20mm, 21mm, etc2)Rustless. 3)Round welded tubes, tube, pipes,Features:1) Sizes: 9.5mm, 12.7mm, 15 ... -appearance,excellent michanical properties. 11)Stainless steel welded tubes, tube, pipes, pipe, round, circular12)Inner packing: Plastic bag13)Outer packing:according to ...