Diamond core bit NQ, HQ, PQ, NQ2, HQ3, PQ3 T2, T6, LTK NMLC, HMLC, NX BW, NW, HW, PW, NWT, ... grades of high quality synthetic diamond are distributed in the depth of impregnated bit's matrix series. The matrix layer ... , T2 76, T2 86, T2 101 T6 series: T6 76, T6 86, T6 101, T6 116, T6 131, T6 146, T6S 101, T6S 116 T series ... } ); } )(); Diamond core bit NQ, HQ, PQ, NQTT, HQWL, T2, T6, NMLC, HMLC