ction CapabilityBase Tube OD:From 5/8" (15.88mm) to 2" (50.8mm)Fin Height :From 1/4" (6.35mm) to 1" (25.4mm)Fin Pitch :From 5 fins per inch to 12 fins per inch(196 fins/metre to 473 fins/metre)Fin Thickness:From 0.012" (0.30mm) to 0.031"(0.76mm)Base Tube Material:Dependent on fin typeFin Material:Aluminium, Copper or Cabon SteelFin Types :L, LL, KL, G, Extruded