The utility model relates to a jack screw and plug screw driver, which is characterized in that a hole is drilled along an axial direction in a screw, and a plug is added on the head of a screwdriver.
一种插孔螺钉及插头螺丝刀。它是在螺钉上沿轴向钻了一个孔，在螺丝刀头部加了一个插头。
A series of screwdriver bars can be installed in the cross plug respectively.
十字插头内可分别安装系列螺丝刀杆类。
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