... /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 bits, oilfield bits and so on ... field of mine, transportation, tunnel and hydroelectric for shelving reticular support.Model114,117,127,437,517,617,637 TypeTricone bits, Steel tooth bits, PDC bits Applicable ...