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Screwdriver is a tool which people always get touch with.But it is difficult to screw the screws which are in the narrow place. It is very troublesome for people to changethe different-length tool bit.
Inspiration of screwdriver is coming from lipstick. The principle of screwdriver is the same as rotating the lipstick.In this way, you can change the length of screwdriver to screw the screws which are screwed in thenarrow place and avoid the inconvenience of taking different-length screwdriver. In the aspect of ergonomic,it is more convenient for another hand to take the screwdriver
because the front of screwdrive