National 4 In. Bronze 5/8 In. Radius Spring Door Hinge is a high-quality door hinge designed to fit standard hinge cutouts with ease. Made from durable cold-rolled steel, this hinge features an adjustable closing speed and tension, allowing you to customize its performance to your needs. It is UL for fire doors, ensuring safety and reliability in various applications. This spring door hinge combines functionality with a bronze finish to provide both strength and style for your doors. Model Number: V522