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Contraction wrench / wrench

Contraction wrench
Contraction 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 need to be changed when dealing with different sizes of screws. Contraction wrench is an inside hex wrench that fit for four sizes of screws. The head of this wrench contains a spring, which compresses according to the size of the screw. 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 TECHNOLOGY

BEIJING INSTITUTE OF FASHION TECHNOLOGY
Beijing, China

Design

BEIJING INSTITUTE OF FASHION TECHNOLOGY

BEIJING INSTITUTE OF FASHION TECHNOLOGY
Beijing, China

Shang Zhi Qi Qiu Wenlong Wang Yong Hu