The "CROWN" impregnated diamond core bits are the most commonly useful bits in mineral exploration, ... we can supply N, H, etc. The "CROWN" impregnated diamond core bits are the most commonly useful bits in the mineral ... : EWM,AWM,BWM,NWMWG Series: EWG,AWG,BWG,NWG,HWGOthers: NMLC,HMLC,LTK48,LTK60,BGM,NGM,ADBG,TBW,TNW,ATW,BTW ...