... tube/pipeDescriptionWe take the most advance technology in copper process, Rolling-Casting. Inner-grooved Copper Tube is of high ... features of high dimensional precision, high heat-exchange efficiency, easy welding, and great corrosion resistance, less crack ... pin holeStandardAISI, ASTM, BS, DIN, JIS, ENMaterialRed copper, brass copper, and so onOutside Diameter4mm~60mmWall Thickness0.25mm~5. ...