Many ornamental and architectural metal articles sourced from China are subject to Section 301 tariffs, which significantly increases landed cost. Importers have responded by qualifying alternative suppliers in other countries, though they must verify that the alternative-origin product meets the same dimensional and finish specifications required by architects or building codes.

The base metal (iron/steel vs. aluminum vs. copper alloy), the form (cast, wrought, extruded), and the surface treatment (anodized, painted, plated) are the primary classification drivers. For example, an aluminum railing system and a steel railing system of identical design will fall under different HTS chapters with potentially different duty rates.