12 1/4" EX422 |
Cutting structure: Large diameter, long projection and widely spaced scoop, chisel, or conical inserts. Designed for maximum penetration in soft formations.
Features: Premium roller-ball-roller bearings and tungsten carbide thrust buttons, with maximum bearing capacity and air flow.
Application: Soft formations such as siltstone, shale, and soft limestone with 1,000 to 15,000 psi compressive strength. |
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