The Belt Tensioner Pulley is engineered to maintain tension on the serpentine belt for the life of the belt--thereby keeping the alternator charging. Product Features:Steel or plastic construction for long-lasting durability against heat, shock and corrosionReplacement stops squeak, squeal or groaning noise associated with a worn Belt Tensioner PulleyDirect replacement for a proper fit every timeVehicle try-on testing and rigorous materials testing to ensure high-quality performance
