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In torsion bolt often appear is not strong enough or it is to plunge into the phenomenon of hand. Through the design, in the screwdriver tail open a special small mouth. Can use the coordination of two screwdriver, can the little strength twist screws and assist the twist screws.
GUANGDONG INDUSTRY TECHNICAL COLLEGE
GUANGZHOU, China
Zhihua Zhong
Qingpeng Zeng
