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Sometimes it takes us great effort to screw and even without effect by a common wrench, Maybe we can lengthen its arm of force? So we did. Now it becomes a retractable and adjustable wrench, It allows us a longer lever to move the stubborn nuts, and also lengthens our "arms" to move nuts placed high or in narrow gaps.
Jia peng Zhu lin Fan Jianjun Zhao bin Liang Hongyu