Pdc Drill Bits For Water And Oil Drilling（3 To 8 Blades）2011-12-26
PRODUCT SIZE
TCI Tricone Bit（IADC CODE:417 427 437 517 527 537 617 637 737）
3 7/8 ,5 1/2, 6 1/2,7 7/8,8 1/2,8 3/4,10 5/8,12 1/4,13 3/4, 17 1/2,22, 24,26
Steel...
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