... 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 ... formations)Being widely used in the 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 water well, oil field, construction, ...