Is a type of device which is designed to tighten the screw or screw out. Screwdriver consists of metal rods The end part is used for mounting with screws, which have different shapes to different types of screws and rods are for catching similar cylinder on the other side for shortfalls by hand or with a screwdriver, some species may be rotated by a motor, it has. Screwdriver works by sending a second (torque) from the rotation to make the screws rotate according to the spiral into or out of other materials.
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