... are distributed in the depth of impregnated bit's matrix series. The matrix layer of the crown contains a uniform distribution ... hardness and abrasiveness of the formation to be drilled.Size Available: Wireline 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 ...