Steel or thermoplastic construction that provides high durability for long life | Bearing is designed for application specific speed and load requirements | Provides reliable operation under severe conditions for year round performance | Has mounting hardware included on some popular applications as an added featureThe ACDelco Professional, premium aftermarket Idler Pulley is designed for use on automobiles and light duty trucks as a locked center tensioning pulley, an automatic belt tensioner pulley, or an idler pulley. It provides reliable operation under severe conditions for year-round performance and has mounting hardware included on some popular applications as an added feature. This premium aftermarket replacement idler pulley is manufactured to meet your expectations for fit, form, and function.