... :T/T in advance.100%prepaid as deposit. Fin TypeCopper Tube O.D.(mm)Row Space(mm)Hole Space(mm)Fin ... .6~3.52.6~3.5//Fin type: hydrophilic fin-window type Plain fin- flat type Sesamoid fin 1. material :copper , aluminum ,galvanized ... products as per customized samples or drawing.14.producing procedure: tube bending, punching fin, expanding, digressing, dryingWelding, leakage test, bending, inspection ...