| 摘要 |
PURPOSE: A double driver is provided to use conveniently by inserting one driver into another driver. CONSTITUTION: A spring(6) is fixed inside a handle by inserting a small driver(5) into a large driver(4). The large driver is fixed in the handle. The small driver and the large driver are used together by using as a ball point pen. Thereby, two kinds of screws are loosened with one driver. Moreover, the driver can be used for many kinds of screws.
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