Product Details: The Dayco 89112™ Gold Label® Heavy Duty Steel Idler / Tensioner Pulley keeps you Ready for the Road Ahead™ by exceeding OEM standards and performance demands. This idler pulley is made with powerful steel to perform well under any condition, 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®.