Bars and rods have uniform solid cross-sections (circular, square, rectangular, hexagonal, etc.) throughout their length. Profiles have a cross-section that does not conform to those standard shapes — for example, an L-, T-, or custom-shaped section. The distinction matters because it affects which subheading applies, though both fall within 7505.

Section 232 measures have applied broadly to steel and aluminum but not to nickel mill products as a category. However, antidumping or countervailing duty orders can attach to specific nickel alloy products from specific countries, and the landscape changes over time. Importers should check the current CBP and Commerce Department order lists for the specific product and origin before entry.