1. stainless steel welded tube for stair rail,safety window, guard door etc. 2. high quality of material and manufacturing Features of stainless steel round tube: Diameter: 6.5mm~219.08mm Thickness: 0.40 to 5.0mm Inch, GA sizes are available Surface available: MF, 180grit, 240grit, 320grit and 400grit Grade: 201, 202, 304, 316, 316L, 321, 409, 430 Standard: GB/T12770; ASTM A554; JIS G3446; DIN ...