This product is a Genuine BMW Engine Crankshaft Thrust Washer with part number 11217635670. It is a small, circular metal component that is placed between the engine crankshaft and the engine block. Its purpose is to reduce friction and wear on the engine components by providing a smooth surface for the crankshaft to rotate on. This particular thrust washer is specifically designed for use in BMW engines and is made with high-quality materials to ensure durability and optimal performance. It is an essential part of the engine and is crucial for the smooth operation of the vehicle.