1.PDC drill bits Manufacturer 2.High Quality PDC cutter for PDC drill bits ... hole, drainage hole, grouting hole, geological and hydrology drilling.2. High wear resistance, impact resistance, high drilling efficiency PDC ... three wings or four wings.Our drill bits adopt 2 cutters, flat and dome-shaped cutters,The flat cutters ... certificate and meet API standard requirements. 9-1/2" ZF 1956 PDC Drill Bits