Circlips, also known as snap rings, are small, circular fasteners used to secure components on shafts or in housings. They fit into a groove and prevent parts from sliding off, making them essential in various mechanical assemblies. Circlips come in two main types: internal and external, depending on whether they fit inside a bore or around a shaft. These fasteners are typically made from spring steel, which allows them to maintain their shape and provide a secure hold. Circlips are commonly found in automotive engines, machinery, and household appliances, playing a crucial role in ensuring the stability of moving parts and assemblies.