... . Steel brake Bundy Tube 4.copper coated brake Bundy Tube Copper coated steel brake Bundy Tube Copper coated steel brake Bundy Tube1,Standard ... :ASTM,DIN,UNI,GB 2,Copper plated,Zinc plated 3,Material:low carbon steel tubeO.D ... ,Standard:ASTM,DIN,UNI,GB3,Material:low carbon steel tube4,Copper plated or Zinc plated5,Wall thickness:0.5mm~0.7mm6 ...