25+ Different Types of Screwdrivers (and Their Uses ...
2021-12-24u2002·u2002The screws are flat on the head, with two rounded holes on opposite sides. This design makes it nearly impossible to remove the screw without having the appropriate tool. Because they offer ample security, you'll typically see these types of screwdrivers being used by maintenance workers in elevators, bus terminals, public restrooms, subways ...
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