| 摘要 |
A wrench comprises a rod, a slide control member, a casing for rotatably accommodating the slide control member, and a retaining device. The rod comprises a driving portion on an end thereof for engaging with a fastener. The slide control member is securely mounted to the rod to turn therewith. The retaining device is mounted in the casing and includes an end operably connected to the slide control member. When a rotational force applied to the casing is smaller than an engaging force between the slide control member and the end of the retaining device, the slide control member and the rod are turned to thereby turn the fastener. When a rotational force applied to the casing is greater than the engaging force between the slide control member and the end of the retaining device, the casing slides while the slide control member and the rod are not turned.
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