Bars and rods that are twisted after rolling remain in heading 7214 by explicit heading text. The twist is a post-rolling operation that does not convert the product into wire; wire of iron or nonalloy steel is separately classified in heading 7217.

Mill certificates showing the melt and pour country, along with a certificate of origin, are the standard documents. For antidumping scope purposes, the chemical composition (carbon content, alloy additions) and the processing route may also need to be certified, since scope rulings often turn on those specifications.