... exploration, we can supply N, H, etc. The "CROWN" impregnated diamond core bits are the most commonly useful bits in the mineral ... carefully selected grades of high quality synthetic diamond are distributed in the depth of impregnated bit's matrix series.The matrix layer ... ,NWG,HWGOthers: NMLC,HMLC,LTK48,LTK60,BGM,NGM,ADBG,TBW,TNW,ATW,BTW,NTW,NXD3,AX,NX,NXC,AXT,T6H,4 ...