External snap rings are circular fasteners used to secure components on shafts or in housings. They fit into a groove on the outside of a shaft, preventing parts from sliding off. These rings are commonly made from materials like steel or stainless steel, providing strength and durability. To install an external snap ring, a special tool called a snap ring pliers is often used. This tool helps to compress the ring, allowing it to fit into the groove easily. External snap rings are widely used in various applications, including automotive and industrial machinery, due to their reliability and ease of use.