Which tool is more easily used by a right handed person, than by a left handed?

screwdriver
9419
hand saw
2381
electric drill
2490
hammer
2373
The reason for the clockwise orientation of most screws and bolts is that supination of the arm, which is used by a right-handed person to turn a screw clockwise, is generally stronger than pronation; while screwing is generally done more often than unscrewing.
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