Order sample:d=6mm, c=12mm, Le=200mm, Lu=180mm, a=30mmPlease specify as: dia6/12x200x180x30mm (dia d/cxLexLuxa mm)d = the diameter of hot zonec = the diameter of cold zoneLe = the length of hot zoneLu = the length of cold zoneStandard sizes:M1700 type (d/c): dia3/6, dia4/9, dia6/12, dia9/18, dia12/24M1800 type (d/c): dia3/6, dia4/9, dia6/12,..