... -20mm Wall thickness: 0.5-2.5mm Aluminum coil tube specification:Alloy: 1100, 1050, 1060, 1070, 3003Out ... diameter: 4-20mmWall thickness: 0.5-2.5mmCommon used specification: 6*0.35, 7*0.4, 8 ... 1.12, 20*1.3mm etc.Usage:Widely used in condenser, water tanks for automobile, intercooler, evaporator, warm wind ... end5.fill with hydronitrogen aluminum coil tube 3003 used for cooker,refrigeratory,radiator