TAISHAN Tapered drill rod is used by a hand held drill machine in Underground mining and for small hole drilling, equipped with small power rock drills, like air leg rock drills, hand held rock drills, etc. It can reduces the expense of impact energy, improves the drilling speed and efficiency, also it can be used for drilling bore hole diameter from 25mm to 43mm usually. Regarding Integral drill steels，the quality of a steel material and a tungsten carbide is very important to get good drilling performance.
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