1.high temperature and wear resistance 2.IADC code suitable for different formation 3.best price 4.fast delivery TCI Tricone ... TypeTCI Tricone bits, Steel tooth bits, PDC bits Applicablewater well, oil field, construction, geothermal, directional boring, and underground foundation work Formation ... work days 12 1/4'' IADC 537 TCI Tricone Bit for oil drillig