It facilitates work when loosening rusted, corroded, or seized screws, converting hammer blows into an extremely powerful rotational movement that loosens overtightened screws. The pressure exerted during the blow ensures that the screwdriver tip grips the screw head, preventing the head from stripping, as often happens when trying to unscrew a seized screw with a hand screwdriver or power drill. It can also help if you find a screw already damaged by previous attempts with an inadequate screwdriver. With hammer blows, the screwdriver tip adheres better to the damaged head.
