sell double-wall copper-coated steel tube

We offer this tubes with different out diameter for both metric and British measurement, and different wall thickness, such as dia.4.76(3/16')*0.7, dia.6.0*0.7, dia.6.35(1/4')*0.7, dia.8.0(5/16')*1.0, dia.9.52(3/8')*0.7, dia.12.0*1.0, etc., also OEM is welcome.
It's with the characteristics of excellent tensile, anti-shock, anti-fatigue, high temperature and high pressure resistance, clean internal surface, little internal resistance, and draining protection etc.I t can be used in general purposes, specially used for condenser, vaporizer, and exhaust tube in refrigerating industry. Automobile industry, fueling and braking in heating system such as oil circuit and oil tube in heating and cooling systems.