The Administration’s updated Section 232 proclamation introduces several changes to how tariffs are applied to aluminum, steel, and copper imports.   The revised framework changes both how duties are calculated and how products are categorized. At a high level, the most important shift is straightforward: tariffs are now generally applied to the full customs value of the imported product, rather than only the value of the metal content.   That changes how duties are assessed on covered products. The proclamation also organizes products into multiple annexes that determine applicable tariff rates, exclusions, and temporary treatment, which is where most of the detail sits. For extruders, Annex I-A includes core aluminum products such as unwrought aluminum, bars, rods, profiles, and certain building products.   These products fall into the 50% tariff category, making this the highest-rate group under the new framework. Annex I-B covers a broader range of down...