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Allen wrench / tool

Allen wrench
Allen wrench

Based on the traditional hex wrench
set as a unit,The design principle of a
spring retractable, the wrenchwill be divided
into filesinto one. It is the unified,simple,
and convenient for aNew tool that
can be adjustable.


Zhejiang University of Technology

Zhejiang University of Technology
hangzhou, China

He Jingjie Chenchen