... :Alloy steel 3.Diameter:25,32,38 or requested Heat Exchanger Finned Tube 1.Bare tube size: OD25mm-OD160mm 2 ... 3.Fins Height: 5mm-25mmType:1.G fin, L fin, LL fin, I fin, E fin, KL fin2.Available Processing Technic: High-frequency ... drilling machine, numerical lathe, all types of lathe.7.Surface finish processpolishing, sand blasting, heat treatment, painting, powder coating, anodizing, electroplating, ...