... bits:PDC bit is developed in a significant advanced technology of diamond drilling. The disc shaped polycrystalline diamond pads, or cutters ... in rows on the bit face. These cutters consist of a layer of polycrystalline diamond on a tungsten carbide substrate and it ... bitMain TypeBit Diameters5 7/8",6",6 1/2",8 1/2",9 1/2",9 5/8",9 7/8",12 1/4", etc.Body ...