The US schedule places open-end wrenches, box wrenches, and combination open/box wrenches together under 8204110030. All other non-adjustable hand-operated spanners and wrenches — such as hook spanners, pin spanners, and face spanner types — fall under 8204110060. The distinction turns on whether the tool fits the open-end or box-end wrench definition, so product design documentation is important for borderline cases.

Taiwan's wrench industry has built a reputation for meeting tight dimensional tolerances and hardness specifications required by professional-grade tool brands, many of which source under private label from Taiwanese manufacturers. This quality positioning, combined with established supply-chain relationships with US distributors, sustains Taiwan's leading role even as China and India compete on price.