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ASTM A500 Square Tubes for Construction ——Specification Range Normal Size Dia(mm) T(mm) Dia (mm) T(mm) Dia (mm) T(mm) 30*30 2-4 120*120 2-14 250*250 8-25 40*40 2-4 125*125 2-14 255*255 8-25 50*50 2-5 ...