... set diamond bits, when drilling in non-consolidated and medium hard rock formation. Series Size AvailableQ seriesAQ, BQ, BQ3, NQ, NQ2, NQ3 ... , PWF, SWF, UWF, ZWFWG seriesEWG, AWG, BWG, NWG, HWG WM series EWM, AWM, BWM Others NMLC, HMLC, LTK48, LTK60 Other sizes ...