| Message: | PDC Sintered concave drill bit is mainly used for drilling soft-medium formation, such as mud shone, limestone, shale, sandstone and granite etc, it has been wildly used to penetrate the degassing hole, drain hole and grouting hole of coal mine, water, road construction, bridge and building. And the drill bit body is made of tungsten carbide, which is the same material as hard alloy, so it has impact resistance and wear resistance. Suits for f |
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