Section 15 BASE METALS AND ARTICLES OF BASE METAL 73 ARTICLES OF IRON OR STEEL 73 20 SPRING AND LEAVES FOR SPRINGS, OF IRON OR STEEL. 73 20 20 HELICAL SPRINGS:FOR ROAD MOTOR VEHICLES Commodity Code Description 73 20 20 10 HELICAL SPRINGS:FOR ROAD MOTOR VEHICLES 73 20 20 90 OTHER HELICAL SPRINGS