Double row of teeth API 8 1/2" kingdream PDC bit 1-certified by API&ISO 2-A large stock 3- ... rows on the bit face. These cutters consist of a layer of polycrystalline diamond on a tungsten carbide substrate and it ... 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.Suitable ...