shank rod we have R32 R28 R25 ect , It is hex22 or hex 25 at the end of the rod , the other end is thread R25 R28 R32 , this shank 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.
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