5.CN 74 – CN 80 Very Hard Formation Rotary Drill Bits
Design features: Closely spaced conical or spherical medium to low projection crack resistant tough carbide Inserts. Load balanced layout of inserts.
Benefits: Stable penetration rates in very abrasive formation. Longer bearing life due to smooth drilling.
Applications: Quartzite, Taconite, Banded Iron. Very hard grade formations of 260 to 400 Mpa.