An internal circlip, also known as an internal retaining ring, is a type of fastener used to secure components within a bore or groove. It is typically a circular-shaped metal ring with inward-facing tabs that fit into corresponding grooves, creating a secure hold. Internal circlips are commonly used in various mechanical and engineering applications to prevent axial movement or retain components such as bearings, gears, and shafts. They provide reliable and efficient fastening solutions, ensuring the stability and integrity of assemblies.