... , mud, or foam flushing. PDC bits are an alternative to T.C. Bits and Surface set diamond bits, when drilling in ... non-consolidated and medium hard rock formation. Series Size AvailableQ seriesAQ, BQ, BQ3, NQ, NQ2, NQ3, HQ, HQ3 ... , PWF, SWF, UWF, ZWFWG seriesEWG, AWG, BWG, NWG, HWG WM series EWM, AWM, BWM Others NMLC, HMLC, LTK48, LTK60 Other sizes ...