Genuine OEM Volkswagen Engine Roller Rocker Arm, part number 030109411B. This precision-engineered component is essential for the valvetrain, transferring the rotational motion of the camshaft lobe into linear motion to open the engine valves. Weighing 0.026 kg, its specific metallurgy and roller design minimize friction and wear. Opting for a genuine OEM roller rocker arm ensures the correct material hardness, surface finish, and dimensional accuracy for precise valve timing and long-term engine reliability.