The surface of the aluminum tube probably would be oxidized, which is a normal characteristic of aluminum. However, it does not affect its use. If you need a beautiful and perfect appearance, it is recommended to grind the surface
Aluminum tube
Diameter (outer diameter): 22mm 23mm 24mm
outer diameter & inner diameter 22x21 mm22x20 mm22x19 mm22x18 mm22x17 mm22x16 mm,22x15 mm,22x14 mm,22x13 mm,22x12 mm,22x10 mm,22x9 mm,22x7 mm,22x6 mm,22x5 mm,23x22 mm,23x21 mm,23x20 mm,23x19 mm,23x18 mm,23x17 mm,23x16 mm,23x15 mm,23x14 mm,23x11 mm,23x10 mm,23x9 mm,23x8 mm,23x5 mm,24x23 mm,24x22 mm,24x20 mm,24x19 mm,24x18 mm,24x17 mm,24x16 mm,24x15 mm,24x14 mm,24x13 mm,24x12 mm,24x11 mm
Length:300mm(11.8inch) 500mm(19.6inch)
Note:
1. Due to manual measurement, please allow an error of 0.1-0.3mm.
2. Because different computers display different colors, thank you for your understanding. The actual product color may be slightly different from the image.