Product Details: The Dayco 89101™ Gold Label® Heavy Duty Steel Idler / Tensioner Pulley ensures you are Ready for the Road Ahead™ with its exceeding of OEM standards and performance demands. This idler pulley is made with strong steel to perform well in any environment, no matter how harsh, reducing vibration for a cooler running belt. In addition, this serpentine belt idler pulley has dual, permanently lubricated sealed bearings and retainers for durability and extended life. This heavy duty idler/tensioner pulley is designed for replacement of idler and tensioner pulleys for serpentine drives in diesel engine applications. FleetPride is your First Click in Heavy Duty®.