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Custom Mirror Hollow Round Pipe ASTM 304 316L 201 Thickness 0.4 - 2.0mm Material: SS201(Ni 0.8%-1.2%) Standard: US ASTM A554 SS301(Ni 6.0%-7.0%) Surface Satin:180G/240G/320G/400G SS304(Ni 8.0%-12.0%) ...