Materialcopper pipe, the common diameter we can supply isΦ7(1/4”/6.35)Φ7.94(5/16”), Φ9.52(3/8”). galvanized plate, aluminum fins etc.Our main fin mold including:1) Φ9.52, 4Rx16T Pitch: 25mm, line spacing 21.65mm, cross arranged2) Φ9.52, hole spacing: 25mm, line spacing 21.65mm, copper fins3) Φ7, ho