... life fast penetration high percentage core recovery in soft to hard rock formatio PDC core bits for oil explorationAslo we could supply ... penetration and high percentage core recovery in soft to hard rock formations.The bit may be used with air, mud, or foam ... set diamond bits, when drilling in non-consolidated and medium hard rock formation. Series Size AvailableQ seriesAQ, BQ, BQ3, NQ, NQ2, ...