Zinc Die Cast With Trivalent Zinc Plating, Ignition Lock Cylinder Bolt, RETAINING NUT-LOCK CYLINDER, BOLT Lock Cylinder Retaining Nut for BOLT Replacement Lock Cylinders, BOLT Cylinder Retaining Nut, 25.4 mm Diameter - 27 UNS thread zinc die cast with trivalent zinc plating., UtilityLockCylNut.