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contrection wrench / Schraubenschlüssel

contrection wrench
contrection wrench

Wrench is an everyday necessity.However,traditional wrenches fit only one size of screw at a time.Therefore it is quite inconvenient for wrenches needed to be changed when dealing with different sizes of scews.The head of this wrench contains a spring,which compresses according to the size of srcew.When the size is relatively small,the larger part of the head could be compressed into inside of the wrench,so that the head can fit perfectly with the screw.

University

Beijing institute of fashion Techno

Beijing institute of fashion Techno
Beijing, China

Mengfei Pei,
Beijing institute of fashion Techno