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Sometimes we have some works that is located in the lower position,we need to stoop for looking at the screw holes,maintaining a stooped posture is inconvenient and tired,so we add a convex mirror on the grip of screwdriver,let it become the third eye when we are using the screwdriver. The user only needs to stand to finish the work with ‘’the Third Eye’’ help.
Ting-Chih Cheng Li Lin