Impact driver
Hand tool for loosening threaded fasteners, with a powerful intermittent action
Impact driver
An impact driver is a tool that delivers a strong, sudden rotational force and forward thrust. The force can be delivered either by a blow struck with a hammer in the case of manual impact drivers, or mechanically in the case of powered impact drivers. It is often used by mechanics to loosen larger screws, bolts and nuts that are corrosively "frozen" or over-torqued. The direction can also be reversed for situations where screws have to be tightened with torque more than a screwdriver can reasonably provide.
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