... distributed in the depth of impregnated bit's matrix series. The matrix layer of the ZM contains a ... of the formation to be drilled. Size Available: "Q" series: AQ, BQ, NQ, HQ, PQ/AQTK, BQTK, BQ3 ... 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 ...