Aviation snips are designed for cutting sheet metal, not for agricultural or horticultural use, so they belong under 820330 (metal-cutting shears) within heading 8203. The 8201 heading is limited to tools principally used in agriculture, horticulture, or forestry; a tool marketed and designed for metalworking does not qualify there.

Tweezers of base metal used as general-purpose gripping tools are classified under 820320. However, tweezers that are specifically designed and presented as medical or surgical instruments may be classified in the medical instruments chapter instead. The intended use and design specification, along with any applicable chapter notes, determine which heading applies.