Retaining rings, also known as snap rings or circlips, arecircular fasteners that hold components together in mechanical assemblies.They typically fit into a groove on a shaft or in a bore (housing) to create a shoulder that prevents parts from dislodging.These rings are available in internal (for bores) and external (for shafts) configurations, and are commonly made of materials like steel, stainless steel, or oil-tempered wire.