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There are four-size hexagonal tools for bicycle common use containing in a keychain that users can turn out the size they want. The body of the keychain can enlarge the torque for female and elders to be more easily to adjust their bikes.
Ching Yi Wang, Fu Chun Wan, Tzu Fan Yang, Yu Liang Shih
Yunlin, Taiwan
Ching Yi Wang, Fu Chun Wan, Tzu Fan Yang, Yu Liang Shih
Yunlin, Taiwan