... API 8 1/2" 5 Blades New PDC Bits for Oilfield Well Drilling1-API or ISO 9001:2008 ... rock 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 ... 517,617,637 TypeTricone bits, Steel tooth bits, PDC bits Applicable water well, oil field, construction, geothermal, directional boring, and underground foundation ...