... exploration 2.Fast drilling, Low pressure , Long life Impregnated diamond core bits1, Being widely used in the geological exploration industry, penetrating ... formations from the softest to the hardest rocks.2, Steel core body with diamonds mixed evenly through a tungsten carbide matrix ... penetration rate , best recovery and long life. 4, Item Size: HQ, NQ, BQ, AQ, FQ, T series, etc5, Item Package: ...