Hearing squealing from under the hood of your high-performance Mercedes AMG? It might be time for a new serpentine belt and related components. This complete kit makes the job efficient. It includes: 1 new serpentine drive belt (check the number 6K2360 matches your old one), 1 automatic belt tensioner, and 3 idler pulleys (one smooth, one grooved, one smooth with bolt). Replacing the tensioner and pulleys at the same time as the belt is smart preventative maintenance – a worn bearing in one pulley can quickly ruin a new belt. This kit fits a wide range of 2007-2015 AMG models with the M156 and M157 engines, including the C63, E63, CLS63, ML63, S63, SL63, and more (see full list in description). The parts are brand new and are original manufacturer quality from brands like INA, Gates, or Continental. A great value compared to buying each piece separately from the dealership. Keep your AMG's accessories (alternator, power steering, water pump, etc.) running smoothly.