... in the depth of impregnated bit's matrix series. The matrix layer of the ZM contains a ... which is required to keep the cost of diamond drilling to a minimum. The optimum diamond size, concentration ... T6 146, T6S 101, T6S 116 T series: T36, T46, T56, T66, T76, T86 Z series: Z46, Z56, Z66, Z76, Z86, ... Z101, Z116, Z131, Z146 B series: B36, B46, B56, B66 ...