There's a long list of aluminum pipe with outer diamter from 10-160mm and thickness from 1 to 20mm. The alloy number can 6063 / 6061 or 6005, with T5 or T6 treatment. The surface treatment includes: anodizing , matt anodizing, electrophoresis, seldom with powder coating. For machining, we can provide fine cutting, punching, drilling and bending. Welding is another option but depends on the thickness.