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Screwdrivers are not safe because the tip of the screwdrivers might stab and hurt people. The Product [Expand & Contract] hid shank of the screwdriver in the grit, and user can push shank how long they need out. By such the design, people can use screwdriver safer and much free.
National Taipei University of Technology
Taipei, Taiwan
Tzu-Kun, Hwang
National Taipei University of Technology
Taipei, Taiwan
Chun-Chieh, Chang
Chi Wang
Tsung-Hsian, Wang
Chih-Wei, Lai
Yun-Huei, Lai