... ,DIN,UNI,GB6,Material:low carbon steel tube7,Copper plated or Zinc plated8,Wall thickness:0.5mm~0.7mm9Outer diameter:Φ3.18mm ... ~Φ12mm Galvanized steel brake Bundy Tube1,Standard:ASTM,DIN,UNI,GB 2,Copper ... plated,Zinc plated 3,Material:low carbon steel tube O.D(mm)Thickness(mm)3.180.74 ...