... or building material etc. Round welded tube SpecificationsFeatures: 1) Sizes: 9.5mm, 12.7mm, 15.9mm, 17mm, 18mm, 19.1mm, ... Rustless. 3)Round welded tubes, tube, pipes,Features:1) Sizes: 9.5mm, 12.7mm, 15.9mm, 17mm, 18mm, 19.1mm, ... GB,ASTM-A312.A5548 Polishing: 80#, 180#, 240#, 320#, 400#, more than 400#9 Application: construction, upholstery, industrial instrument10)Rustless, good corrosion resistance ...