Section 15 BASE METALS AND ARTICLES OF BASE METAL 74 COPPER AND ARTICLES THEREOF 74 15 SCREWS, BOLTS, NUTS, SCREW HOOKS, RIVETS, COTTERS, COTTER-PINS, WASHERS, 74 15 33 SCREWS; BOLTS AND NUTS OF COPPER Commodity Code Description 74 15 33 00 SCREWS; BOLTS AND NUTS OF COPPER