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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。

University

Zhengzhou University of Light Industry

Zhengzhou University of Light Industry
Zhengzhou, China