... can supply N, H, etc. The "CROWN" impregnated diamond core bits are the most commonly useful bits in the mineral ... synthetic diamond are distributed in the depth of impregnated bit's matrix series.The matrix layer of the crown ... bits are manufactured to give optimum penetration rates and bit life, which is required to keep the cost of ... ,SK6L146,TT46,TB56,TS116,CHD101All Chinese sizes Diamond Core Bit