Steel tooth tricone bit 1)certified by ISO9001&API 2))used for water well, ... field 3)IADC:114,117,127,437,517,617,637 Steel tooth tricone bit 1.Sizes range from 3 7/8" to 26 ... Model 114-117,127,437,517,617,637 TypeTricone bits,Steel tooth bits,PDC bits Appliable water well, oil field, ... formation Bearing rubber seal or metal seal Paking wooden box,steel box,or as your requirements Payment Term T/T, ...