The product is an original Mercedes-Benz Engine Crankshaft Vibration Damper designed for the W126 420SEL, 560SEC, and 560SL models from 1986 to 1991. This crank pulley features interchange part numbers for various Mercedes Benz models and is an OEM genuine part with the manufacturer part number 1160322704. It is specifically designed to dampen vibrations in the engine's crankshaft, ensuring smoother and more reliable performance for your Mercedes-Benz vehicle.