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ASTM A554 Welded Stainlee Steel Rectangular Tube Hairline 180#, 240#,320# Tolerance a) Outer Diameter: +/- 0.03mm b) Thickness: +/- 0.03mm c) Length: +/- 0.5mm Size 8-400mm ,17, 18, 19, 20, 21, 22, ...