Subheading 741510: Copper; Nails and Tacks, Drawing Pins, Staples and Similar Articles of … etc.
Subheading 741521: Copper; Washers, (Including Spring Washers), not Threaded
Subheading 741529: Copper; Rivets, Cotters, Cotter-pins and Similar Articles, not Threaded
Subheading 741533: Copper; Screws, Bolts and Nuts, Threaded
Subheading 741539: Copper; Articles N.E.C. in Heading No. 7415