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8 1/2: 1.● Brush the coloring agent on the surface of the drill bit, and penetrate for 15 minutes. ● After washing with water, spray the photographic developer. ● Use a black light to irradiate the surface ...

12 1/4"tricone Bit Drill Bit: effectively reduce the wear of tooth palms,improve the diameter protection performance of drill bits,and prolong the service life of drill bits in abrasive or directional wells or horizontal ...

11 5/8' Tricone Bit IADC127: 1.The strengthening of bits and inserts can effectively reduce the wear of tooth palms,improve the diameter protection performance of drill bits,and prolong the service life of drill bits in abrasive ...

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