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Question:

What's the difference between an ordinary wrench and a fast wrench?

What's the difference between an ordinary wrench and a fast wrench?

Answer:

Different convenience(1) ordinary wrench: the size adjustment is slower, the error is bigger.(2) quick wrench: automatically adjust the opening size of the screw. Quick and convenient.
Different ways of working:(1) ordinary wrench: adjust the opening size by hand screw. Each twist to wrench screw out.(2) quick wrench: automatically adjust the opening size by screwing (the other is the use of the advance of the 12 edge aperture matching) of each screw is no need to let out the screw wrench. (a unidirectional occluding device, similar to a bicycle flywheel)
The protection of screws is different(1) ordinary wrench: adjust the error is large, easy disengaging (screw grinding edges).(2) quick wrench: tight bite screw. Not easy disengaging (screw grinding edges).

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