... about sell rock bits,tricone bits, diamond bits,PDC bits,TCI bits, steel tooth bits, milled tooth bits, rock bits, oilfield bits and so on ... .Specification: diameter from 5-1/8” to 13-1/2”.There are different PDC (polycrystalline diamond compact ... ,117,127,437,517,617,637 TypeTricone bits, Steel tooth bits, PDC bits Applicable water well, oil field, construction, ...