| 摘要 |
A pipe wrench includes a C-shaped head including two jaws and a space is partially enclosed by the two jaws. A passage is defined in an inside of the head and communicates with the space. A spring and an end member is received in the passage. A C-shaped engaging member is rotatably engaged with the space between the two jaws and has a toothed outer surface which is engaged with the pawl. When the opening of the head and the engaging member is in alignment with each other, the wrench is able to remove from the object to be tightened or loosened.
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