Standard: Jis, aisi, astm, gb, din, en place of origin: Hebei china (mainland) Brand name: Chisco Model number: 201 304 316 Type: Welded Steel grade: 300 series Application: Stairs, handrail, door handle, ornamental Welding line type: Erw Thickness: 0.1mm---3.8mm Outer diameter: 6mm--219mm Every tube is sleeved in plastic bag individually, and several tubes are packed to be bundle without any logo.