The External Retaining Ring is used to support and hold the pinion in a Hydraulic Swing Drive. The ring is circular with a gap that allows it to be placed onto a shaft or into a bore without having to slide it over the end of the shaft or bore.Attributes:• Handles the vibrations caused by the movements• Manufactured to precise specifications and are built for durability and reliabilityApplications:The External Retaining Ring securely fits into a groove or recess on the Swing Drive housing or Pinion shaft.