... Characteristic Bimetal Die-Casting Aluminium Radiator1.Using the seamless steel tube(1.3-1.8mm) as the lining mixed the ... sure the better heat effect. Each fin is connected by inner thread, Easy to assembly ,transport, repair, rich designs, reasonable ... .3. Quality standard: CE(EN-422), ISO9001,ISO14001.Packing : inner packing,plastic bags. Outer packing, standard cartons Bimetallic Radiator QS500120