The screwdriver is a kind of device which is designed to screw tightly or loosen screws, screwdriver across to contain...Metal rods. The end of the holder with the screw. Which have different shapes to make available to the various types of screws and rods for holding similar cylinder on the other side to solve by hand. Or some kind of screwdriver may be rotated by motor.(torque) from rotation to the end. The screw rotate according to spiral into or out of another material
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