... PDC Bits for water well drilling (12-1/4") we can supply rock bits,tricone bits, kingdream bit,diamond bits,PDC bits,TCI bits, steel tooth bits, milled tooth bits, rock bits ... and hydroelectric for shelving reticular support. Model114,117,127,437,517,617,637 TypeTricone bits, Steel tooth bits, PDC bits Applicable water well, oil field, construction ...