1,Standard:ASTM,DIN,UNI,GB 2,plated 3,Material:low carbon steel ... .700.71,Use:automobile brake system,condenser, evaporators.2,Standard:ASTM,DIN,UNI,GB3,Material:low carbon steel tube4,Copper plated ... .5mm~0.7mm6,Outer diameter:Φ3.18mm~Φ12mm auto evaporator pipe