Diamond reaming shell NQ, HQ, PQ, NQ2, HQ3, PQ3 T2, T6, LTK NMLC, HMLC, NX BW, NW, ... HW, PW, NWT, HWF Specialisted in producing varies kinds of diamond ... chert, abrasive rock etc. Including impregnated diamond core bit, surface-set diamond bit, reaming shells, casing bit, casing ... Reaming shell is set with natural or synthetic diamond, and it is used to couple the drill ...