... bits,kingdream bit,smith bit,tricone bits, diamond bits,PDC bits,TCI tricone bits, steel tooth bits, milled tooth bits, TCI rock bits, oilfield bits ... and so on .Specification: diameter from 3-1/8” to 17”.There are different PDC (polycrystalline diamond compact ... ,127,437,517,617,637 TypeTricone bits, Steel tooth bits, PDC bits Applicable water well, oil field, ...