... are distributed in the depth of impregnated bit's matrix series.The matrix layer of the crown contains a uniform distribution ... cost of diamond drilling to a minimum.Size Available:Q Series: AQ,BQ,NQ,HQ,PQ/AQTK,BQTK,BQ3,NQ2,NQ3 ... ,NQTT,HQ3,HQTT,PQ3,PQTTT2 Series: T2 46,T2 56,T2 66,T2 76,T2 86 ... ,T2 101T6 Series: T6 76,T6 86,T6 101,T6 116,T6 131 ...