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When you use the spanner, you may feel easier if the handle is longer.
When you use the screwdriver, you may feel easier if the torque is greater.
They always appear together,why not make them symbiotic,the idea is that the screwdriver can lengthen the handle of the spanner.Meanwhile, the spanner can help the screwdriver loosen tight screws.
Jiangnan University
Wuxi, China
Jiangnan University
Wuxi, China
Yang Nan
Xu Honglei
Lv Changfu
Li Cun
