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They make use of two third-order levers connected at one fixed end, with the pincers at the others. The tweezers are typically manoeuvred over the item, and the tweezers are pinched by the fingers in the middle, with the pincers taking the object between them.
Tweezers have many uses, such as in the manual construction or repair of many things such as models, clockwork, surface mount electronics; or in cosmetics for plucking eyebrows.