... Files锉刀 Taps and tapping丝锥与攻螺纹 Spanners and screwdrivers扳手和螺钉旋具 ...
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The advantage is that we work without any risk of breaking taps on particularly expensive work pieces and it saves also a lot of time by simplifying tapping operations.
优势还体现在当它工作时无须担心丝锥断裂，尤其是在昂贵的工件上工作时，能起到有效的保护作用，同时还可以为你节省很多的时间。
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