... rock bits,kingdream bit,smith bit,tricone bits, diamond bits,PDC bits,TCI tricone bits, steel tooth bits, milled tooth bits ... rock bits, oilfield bits and so on .There are different PDC (polycrystalline diamond compact) grades and shapes applied for rock formations ... ,127,437,517,617,637 TypeTricone bits, Steel tooth bits, PDC bits Applicable water well, oil field, construction, geothermal, directional ...