Impact Screwdriver Is is used to break loose or tighten a screw. A hammer is used to strike the end after the screwdriver holder is placed in the head of the screw and rotated the desired direction.
The force from the blow does two things:
It applies a force downward holding screwdriver tip in the slot and also applies a twisting force to loosen (or tighten) the screw.
An impact screwdriver used to remove slotted or Phillips head fasteners that
cannot be broken loose using a standard screwdriver.
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