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Lub Npe: Rectangular Steel Pipes Standard: ASTM A500, ASTM A53, EN10219, BS1387-1985 Khoom siv: Q195, Q215, Q235, Q345 Specification: OD: 10mm × 10mm —-400mm × 200mm6 Phab ntsa thickness: 20mm. - dipping galvanized, pre-galvanized, roj txheej, lacquering