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Screw does not slip / screw

Screw does not slip

Depth using pentagonal opening, increased its contact
surface, in addition to deepen the groove of 3mm Make him
a better fitting with a screwdriver, not easy to wear off the edge
of the slot, it will not lead to slip。


Zhengzhou University of Light Industry

Zhengzhou University of Light Industry
Eastern International Art College
Zhengzhou, China