Belt Drive Idler/Tensioner Pulley; DriveAlign Idler Pulleys provide OE-quality fit to passenger cars and light trucks, performing as a locked center tensioning pulley, an automatic belt tensioner pulley or an idler pulley. Steel and thermoplastic construction designed to tight manufacturing tolerances for high durability and quality performance Built to last with a superior resistance to dirt, salt, chemicals and other under-hood contaminants OE-quality fit for virtually every domestic or import vehicle on the road today Bearings meet or exceed OE standards with application-specific speed and load requirements, to withstand high under hood temperatures Premium bearings eliminate bearing noise Mounting hardware included for some popular applications Reliable operation under severe conditions