1. HS Code: Round Tubes:73063000, Square Tubes: 73066000 2. Specification: A. Round tube: Diameter: 10mm ---- 200mm Thickness: 0.6mm ---- 5.5mm Square tube: Width: (10-180)mm X (10-180)mm Thickness: 0.6mm ----5.5mm B. Rectangular tube: Width: 10mm-180mm Height: 10mm-180mm Thickness: 0.6mm ---- 5.5mm 3. Base Metal: Q235 (Equivalent to DIN EN10025 S235JR, ASTM A283M Gr.D) 4. Finish: 1) hot dip galvanized 2) PVC coating 3) Polyester coating 4) Pre-galvanized 5) Galvanized plus PVC coating, Polyester coating 5. Standard: SY/T 5768-1995