Application： Tubing is used to extracting petroleum and natural gas for a well. Standard： API SPEC 5CT,API SPEC 5B,ISO 11960 Casing Application： Casing serves as walls of a well. Standard： API SPEC 5CT,API SPEC 5B,ISO 11960 O.D: 48.26mm~114.30mm Wall Thickness:3.18mm~16mm