Newest TCI tricone bit 1)used for oil filed, water well 2)metal seal ... Model 114-117,127,437,517,617,637 TypeTricone bits, Steel tooth bits, PDC bits Appliablewater well, oil field, construction, geothermal, ... formation Bearing rubber seal or metal seal Paking wooden box, steel box, or as your requirements Payment Term T/T,L ... Series, 6-- Series,etc. kingdream14 3/4" Newest IADC 537 TCI Tricone bit