High Air Pressure DTH Drill Bits(10-12 Inch)
2020-9-7 · Roschen produce big size DTH hammer and bits, the size ranges from 3 inch to 24 inch, the big size dth hammer and bits are designed based on the characteristics of the wells, oil, gas and construction drilling, our company self-designed, developed and manufactured this kind of high air pressure DTH hammer and big size down the hole drilling bits.
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