Genuine OEM Volkswagen Roller Rocker Arm, part number 04E109411T. This component is part of the engine's valve train system. It pivots on a shaft and uses a roller to reduce friction, transferring the motion from the camshaft to the valve stem, thereby opening and closing the valves. Located within the cylinder head assembly. Manufactured with precise tolerances for smooth operation and accurate valve timing. Genuine OEM rocker arms ensure the correct lift and duration for optimal engine performance and longevity.