... exported to the United States,Canda, Italy,India and other 16 countries for many years .Low carbon steel tubeDouble wall (cut ... .:4.76mm,6.00mm,6.35mm,8.00mm,9.53mm,10.00mm 12mmThickness: 0.71±0.07mm 1.0±0.07mmCoating ... .:4.76mm,6.00mm,6.35mm,8.00mm,9.53mm,10.00mm 12mmThickness: 0.71±0.07mm 1.0±0.07mmCoating ...