The 4 Inch OD To 2.5 Inch ID Aluminized Reducer is a practical and versatile product made of durable aluminized steel. With a 4-inch outer diameter (Measurement A) and a 2.5-inch inner diameter (Measurement B), it fits most makes and models. Its 8-inch overall length ensures a secure and reliable connection. Sold individually, this aluminized reducer offers a cost-effective solution for various automotive applications. Its high-quality construction guarantees long-lasting performance, making it an essential component for any vehicle.