... Material: Alloy steel Certificated by API&ISO9001:2008 8 1/2" New PDC Bits for Well Drilling Description about sell rock bits ... ,tricone bits, diamond bits,PDC bits,TCI bits, steel tooth bits, milled tooth bits, rock ... ,127,437,517,617,637 TypeTricone bits, Steel tooth bits, PDC bits Applicable water well, oil field, construction, geothermal, directional boring ...