... we can supply N, H, etc. The "CROWN" impregnated diamond core bits are the most commonly useful bits in the ... of high quality synthetic diamond are distributed in the depth of impregnated bit's matrix series.The matrix layer of ... required to keep the 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 ...