... on a tungsten carbide substrate and it allows the bits to drill through formations which are too soft or too ... or horizontal drilling and can be used for either non core, side track or recovery purposes.PDC cutters we use ... LtdPDC bitMain TypeBit Diameters5 7/8",6",6 1/2",8 1/2",9 1/2",9 5/8",9 7/8",12 ... Body TypeMatrix or SteelBlades2~9 Wings.Cutter Sizes5/16"(8mm),1/2"(13mm),5/8"(16mm),3/4"(19mm),etc. ...