3.CN50 – CN 60 Series Medium Hard Formation Rotary Drill Bits
Design features: Moderately spaced conical inserts with medium projection. Doublerow gage protection inserts. Hard metal deposit on nose area to protect against cone shell erosion.
Benefits: Good penetration rates and longer life in medium hard and moderately abrasive formation. Longer bearing due to Smooth Drilling.
Applications: Suitable for Granite, Marble, Hard Sandstone – Medium Hard formations with Compressive Strengths of 90 – 150 Mpa.