... tubeStandardASTM A554, A249, A269 and A270, A312 A304Material Grade201 ( Ni 0.8%),202 (Ni 3.5%~4.5%),301(Ni 5 ... .3mm - 3.0mmLength6m or as customers' requestTolerancea) Outer Diameter: +/- 0.2mmb) Thickness: +/- 0.02mmc) Length: +/- 5mmSurface180G, 320G, 400G Satin / Hairline400G, 500G, 600G ...