Special wrench is tightening or loosening screws, nuts and other tools, the use of leverage wrenching bolts, screws, nuts and other threaded bolt or nut holding tight sleeve openings or holes firmware hand tools. Usually at one or both ends of the wrench handle system folder shank has an external force is applied to handle external force is applied, you can wrenching bolts or nuts holding sleeve openings or holes bolt or nut. When using the thread applied along the direction of rotation in the handle force can wrenching bolts or nuts. http://www.hbbtglj.com/ 

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