| 摘要 |
A selective one-way wrench includes an annular head comprising a first space defined therein, a second space communicated with the first space and a third space communicated with the second space. A gear is put rotationally in the first space. A transmission is put in the second space for transmitting torque from the annular head to the gear in selective one of two opposite directions. A switch is put in the second space through the third space and connected with the transmission. The transmission prevents the switch from rotating and rocking on the annular head.
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