Section 15 Base metals and articles of base metal 72 Iron and steel 72 28 Other bars and rods of other alloy steel; angles, shapes and sections, of other alloy steel; hollow drill bars and rods, of alloy or non-alloy steel. 72 28 80 Hollow drill bars and rods 72 28 80 00 Hollow drill bars and rods Commodity Code Description 72 28 80 00 000 Hollow drill bars and rods