... are distributed in the depth of impregnated bit's matrix series. The matrix layer of the ZM contains a ... are dependent on the hardness and abrasiveness of the formation to be drilled. Size Available: "Q" series: AQ, BQ, NQ, ... HQ, PQ/AQTK, BQTK, BQ3, NQ2, NQ3, NQTT, HQ3, HQTT, PQ3, PQTT T2 series: T2 ... T2 66, T2 76, T2 86, T2 101 T6 series: T6 76, T6 86, T6 101, T6 116, ...