steel tubes & pipes 1.Galvanized Steel Tube 2. Steel brake Bundy Tube 3. ... ,Standard:ASTM,DIN,UNI,GB6,Material:low carbon steel tube7,Copper plated or Zinc plated8,Wall thickness:0.5mm~0.7mm9Outer ... steel brake Bundy Tube1,Standard:ASTM,DIN,UNI,GB 2,Copper plated,Zinc plated 3,Material:low carbon steel tube O ...