Section 15 BASE METALS AND ARTICLES OF BASE METAL 73 ARTICLES OF IRON OR STEEL 73 04 TUBES, PIPES AND HOLLOW PROFILES, SEAMLESS, OF IRON (OTHER THAN CAST IRON) 73 04 29 OTHER CASING/TUBING/DRILL PIPE USED IN DRILLING FOR OIL/GAS Commodity Code Description 73 04 29 00 OTHER CASING/TUBING/DRILL PIPE USED IN DRILLING FOR OIL/GAS