The answer is outliners. They're small, precise trimmers built for finish and detail work, not full cutting jobs.
Outliners are also called trimmers or edgers, and they're what a barber reaches for on hairlines, edges, and eyebrows — the fine work a full-size clipper isn't precise enough to handle. Detachable-blade and adjustable-blade clippers do the bulk cutting on a haircut, but they're not the tool for detail work.
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