The product is a MERCEDES-BENZ A W177 Belt Tensioner with the manufacturer part number A2822000170. It is designed for a 1.3 petrol engine with a power output of 120kW, manufactured in the year 2018. This belt tensioner is essential for regulating the tension of the timing belt in the engine, ensuring optimal performance and longevity. As a genuine part from MERCEDES-BENZ, it is engineered to meet the highest standards of quality and durability for your vehicle.