An External Retaining Ring, also known as an external snap ring, is a type of fastener used to secure components on the outside of a shaft or in a groove. It is used to hold various components in place within the differential. It secures the components that are responsible for engaging or disengaging the locking mechanism.Attributes:• Provide strength and durability.• Designed to resist corrosion.• Withstand vibrations and extreme conditions. Applications: An External Retaining Ring secures the essential components that enable the differential lock to function properly, ensuring efficient power distribution.