Circlip, suitable for ZF 12AS series 12-speed AMT auxiliary box assembly. Made of high-elasticity spring steel with strong toughness and durable elasticity, free from plastic deformation easily. Smooth edge without burrs enables convenient installation and tight fitting in groove positions for reliable axial limiting. It effectively prevents axial play of shaft and gear parts, resisting oil pollution, rust and temperature variation. Performance remains stable without loosening or fracture in long-term use. Fully compliant with original factory sizes for strong interchangeability, suitable for precision limiting assembly inside transmission.