... take the most advance technology in copper process, Rolling-Casting. Inner-grooved Copper Tube is of high cleanliness ... pin holeStandardAISI, ASTM, BS, DIN, JIS, ENMaterialRed copper, brass copper, and so onOutside Diameter4mm~60mmWall Thickness0.25mm~5.0mmLengthas ... grates, etc.Company nameTianJin Middle East Steel Union Co.,LtdContact personLucy TangMobile phone+86-15122066917TEL.+86-022-26346801FAX ...