... 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 ... T56, T66, T76, T86 Z series: Z46, Z56, Z66, Z76, Z86, Z101, Z116, Z131, Z146 B series: B36, B46, B56, B66, ... B76, B86, B101, B116, B131, B146 WF series: HWF, PWF, SWF, ...