... -30mm 3.Fins Height:5mm-25mm Carbon steel finned tube for heating asphalt:1.G fin, L fin, LL fin, ... welding/Extruded/L-foot etc. 3.Types of bare tube: Seamless & Welded 4.Material: Carbon steel/Stainless steel ... ~50.87~11.5FPIFin Height Max 16mmHL-Fin Tube(Wrap On Type)All Kind of Material can ... .70~50.87~11.5FPIFin Height Max 16mmHG-Fin Tube (Imbeded Type)Aluminum A1100, A1050, A1060High Frequency Welded ...