... synthetic diamond are distributed in the depth of impregnated bit's matrix series.The matrix layer of the crown contains a uniform ... cost of diamond drilling to a minimum.Size Available:Q Series: A,B,N,H,P/ATK,BTK,B3,N2,N3 ... ,NTT,H3,HTT,P3,PTTT2 Series: T2 46,T2 56,T2 66,T2 76,T2 86 ... ,T2 101T6 Series: T6 76,T6 86,T6 101,T6 116,T6 131 ...