bundy tube Low carbon steel tube Double wall (cut to length & in coil) O.D.:4.76mm,6.00mm,6.35mm,8.00mm,9.53mm,10.00mm Thickness: 0.71±0.07mm Coating: copper, white zinc, yellow zinc, PVF. Single wall(in coil) O.D.:4.76mm,6.00mm,6.35mm,8.00mm,9.53mm,10.00mm Thickness: 0.71±0.07mm Coating: copper, white zinc, yellow zinc, PVF. be made into brake system, cooling system, air conditioner condenser.[...]