... not taking core)-Φ 28-Φ 153PDC bit (PDC)Used for soft-hard strata in the drilling. With the new type cutting superhard ... t take core: Φ 60, 75, 94, Φ Φ Φ 110, 113, 133, Φ Φ Φ 153, 190, 215 Φ Φ.Type-to take core: a type, ladder type; Don't take core: arc ... pillar, ladder (type), 3 wing cone scraper type, concave 3 wing scraper type.PDC ...