Overburden Casing System, Button Bits, Shank Adapters manufacturer / supplier in China, offering Symmetric Casing System Concentric Design for 219mm Casing Tube Pilot Bit and Ring Bit, 168mm Casing Tube in Symmetric Casing System with Matched DHD350 Ql50 SD5 M50 Hammer Bit, Concentric Symmetric Casing System for 273mm Tube and DHD380 Ql80 SD8 M80 Hammer Bit and so on.
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