... ,used drill bits stock,used mud pumps,etc9> be used for water well, oil field, underground, construction, geothermal, directional ... cone. Hardface heard bearing surface. Cone bearing inlaid with friction-reducing alloy. Abrasion resistance and seizure resistance of the ... capability and increases ROP.5> Product ApplicationIt is suitable for sidetracking, deep well drilling and old well repairing.6 ...