... Well Drilling Description 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 ... support.Model114,117,127,437,517,617,637 TypeTricone bits, Steel tooth bits, PDC bits Applicable water well, oil field, construction, geothermal, directional boring ...