The Genuine BMW Accessory Drive Belt is a high-quality replacement belt for BMW vehicles. It is designed to fit perfectly and provide reliable performance. This belt is made from durable materials and is built to withstand the rigors of daily use. It is an essential component of the vehicle's accessory drive system, responsible for powering various accessories such as the alternator, power steering pump, and air conditioning compressor. This belt has the part number 32421706597 and is an authentic BMW product.