The Genuine Porsche CV Joint Lock Ring - 90004101400 is a small, circular metal ring that is used to secure the CV joint in place. It is designed specifically for Porsche vehicles and is made from high-quality materials to ensure durability and long-lasting performance. This lock ring plays a crucial role in keeping the CV joint securely attached to the axle, preventing it from slipping or becoming dislodged while the vehicle is in motion. It is an essential component for maintaining the proper function of the CV joint and ensuring smooth and safe driving.