Bundy Tube: 1.Steel bundyTube 2.Copper Coated Steel Tube 3. Steel brake Bundy Tube 4.copper coated brake Bundy Tube Copper coated steel brake Bundy ... ,GB 2,Copper plated,Zinc plated 3,Material:low carbon steel tubeO.D(mm)Thickness(mm)3.180.74.000.74.760.75 ... ,DIN,UNI,GB3,Material:low carbon steel tube4,Copper plated or Zinc plated5,Wall thickness:0.5mm~0.7mm6,Outer diameter:Φ3.18mm~Φ12mm