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"The Shark" highly enhances peoples working efficiency. By analyzing the deficiencies of normal spanners I was able to find solutions to the damage caused to nuts by the high slippage of normal adjustable spanners. My concept THE SHARK addresses the problems by adjusting the position of upper and lower jaws to control the opening width, the desire one spanner fixes all sizes of nuts has been achieved. The moving direction of jaws and sliders always remains vertical with the force direction when twisting nuts, this effectively solves the high slippage issue happened on normal adjustable spanners. Currently, I have patent my work regionally.