... quality synthetic diamond are distributed in the depth of impregnated bit's matrix series.The matrix layer of the crown contains ... impregnated bits are manufactured to give optimum penetration rates and bit life, which is required to keep the cost of diamond ... ,BTW,NTW,NXD3,AX,NX,NXC,AXT,T6H,4 9/16,NWD4,412F,SK6L146,TT46,TB56,TS116,CHD101All Chinese sizes