17-1/2'' IADC127 Tricone Bits with Steel Milled Teeth ...
17 1/2” IADC Code 127 Tricone Bits with Steel Milled Teeth. Tricone drill bits include Steel Tooth (or called milled tooth) bits and Tungsten Carbide Insert (TCI) bits, of which TCI drilling bits are much more durable than Steel Tooth ones, but carry a higher cost to manufacture.
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