The correct belt tension is crucial in order to extend the life of your car's accessory belt. The accessory belt is one of the main means of power transfer to your car's accessories. Power comes from the crankshaft and is then supplied to parts like the water pump and alternator. To do its job, the accessory belt relies on the Accessory Belt Tension Pulley. The Accessory Belt Tension Pulley is built to do one thing: to provide correct belt tension. By doing this, it prevents belt slipping, which is one of the common causes of accessory belt failure. The pulley keeps you from having to re-tension your car's accessory belt at all times. At first glance, the Accessory Belt Tension Pulley looks simple. In reality, however, it's composed of several important parts such as the base, damping mechanism, tension spring, arm, bearings, sealing disk, and bolts. The pulley is either made of plastic or metal. A plastic pulley retains heat a lot longer. A metal pulley disperses heat, and it's also able to deflect dirt more effectively. When it comes to toughness, a plastic pulley is weaker as it is prone to melting while a steel pulley is not. If your car's Accessory Belt Tension Pulley is already damaged, better get a replacement now. Find one here at Car Stuff. We offer high-quality pulleys that you can get at affordable prices. Simply place your order and we'll deliver the part right away.