The Grand Rock 90 Degree Tangent Cut Elbow is a practical and versatile choice for welding and repairing exhaust systems. With a 4-inch diameter O.D/O.D, aluminized construction, and a 4.5-inch centerline radius, this elbow is designed to fit most makes and models. Its 6.5-inch A & B length makes it suitable for a variety of applications, and its 90-degree tangent cut ensures a secure and precise fit. Sold individually, this elbow is a reliable choice for anyone in need of a durable and effective exhaust system component.