... HQ,BQ diamond drill bit /diamond core bitSize Available: "Q" series: AQ, BQ, NQ, HQ, PQ/AQTK, BQTK, BQ3, ... NQ2, NQ3, NQTT, HQ3, HQTT, PQ3, PQTT T2 series: T2 46, T2 56, T2 66, T2 76, T2 86 ... 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, ...