... ,BHG,BCD Outdiameter :3.17mm-12mm Single Layer Copper-coated Steel Bundy Tube/Pipe Features :1) Material :SPHC, SPCD,ST-14, ... 17mm-12mmThickness :0.5-1.0mm3) Widely used in kinds of freezing equipment , cycled pipes in cars and electronical heatting fields ... transport the oil ,gas ,liquid.4) Surface treatment :Copper coated or zinc coated are available Single Layer Copper-coated Steel Bundy Tube/Pipe