A set consisting of a handle and multiple interchangeable bits is generally classified as a screwdriver set rather than as separate parts, provided the set is put up for retail sale as a unit. The essential character is that of the complete tool. However, bulk imports of bits sold separately from handles may classify differently, so the commercial presentation and packaging matter for classification purposes.

Country of origin for hand tools is determined by substantial transformation — the country where the last process that fundamentally changes the article's character occurs. Simply attaching a handle to an imported blade in a third country may not constitute substantial transformation. CBP has issued rulings on specific screwdriver assembly scenarios, and importers with complex supply chains should seek a binding ruling before committing to a sourcing structure.