... 8 to 26 Covers almost all IADC codes suitable for sidetracking, deep well drilling Advantage: 1> TCI ... drill bits stock,used mud pumps,etc9> be used for water well, oil field, underground, construction, geothermal, ... and increases ROP.5> Product ApplicationIt is suitable for sidetracking, deep well drilling and old well repairing ... 8149.2517, 527, 537, 6176152.4517 TCI single cone bit for hole boring