8 1/2' 10 1/2' 12 1/4' Tricone Drill Bit For Hard
417 427 437 517 527 537 617 627 637 . 737 837 832 415 425 435 445 525 625 ... medium soft, hard, medium hard, very hard formation. Button size (extra fratures) Button bit,saw steel ... ,Kingdream Iadc 537 Tci Bit/tricone Rock Bit/tci Tricone Drill Bit,High Quality Rock Bits Drill Boring,Retractable Rock Drill Bits,Tci Tricone Bit kingdream IADC ...
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