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ASTM, Bs, GB, JIS, ASTM A53-2007 Galvanized Round Tube Galvanized Round Tube Feature: Original: Liaocheng/Shangdong/China Length: 6m, 5.8m, 1-6.5m Thickness: 1.5 - 8.18 mm Outer Diameter: 20 - 219 mm ...