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Normal screwdrivers are in the form of a cylinder. The plate is usually carved or the material has frictional force, but the power of thumb and index finger does not exhibit all the power when turning the screwdriver. In particular, when the screw is tightly stuck, women or elders cannot turn the screwdriver hard enough to take out the screw. With the complete shape itself, the top of this screwdriver is flat to allow full strength between just the thumb and index finger. Only a part of a regular screwdriver was changed where grabbing and using the screwdriver is same while it is also easy to use.
Yong In University
Yong In, South Korea