... seal8> including drill rods,drill collar,rerun steel tooth bits, ,used drill bits stock,used mud pumps,etc9> be used for water ... > Bearing StructureHigh precision journal bearing, Ball lock the cone. Hardface heard bearing surface. Cone bearing inlaid with friction-reducing alloy. Abrasion resistance ... , 527, 537, 6175 7/8149.2517, 527, 537, 6176152.4517 single roller cone bits