12 1/2'' Inches IADC 217 Journal Sealed Bearing Tricone Driling Well Bit

12 1/2'' Inches IADC 217 Journal Sealed Bearing Tricone Driling Well Bit. new bit. High strength tungsten carbide teeth, strong wear resistance, long service life. Optimized cutting structure, fast drilling speed and high rock breaking efficiency. Reliable sealed bearing system, stable operation, low failure rate. Good impact resistance, suitable for various hard rock formations. Accurate dimensional tolerance, easy installation and matching. Stable drilling performance, reduce construction cost.