... carbon steel tube popular size: diameter4mm,4.76mm,6mm,6.35mm,7.94mm thickness:0.5mm,0.65mm,0.7mm The main products ... in our company are double wall coil weld steel tube, single wall high frequency weldtube, plated copper steel tube, zn coated tube ,condenser ... have been export to Europe, America, the Middle of East, Africa and South-East of Asia. "Quality is first , credit is ...