National 4 In. Satin Nickel 5/8 In. Radius Spring Door Hinge is a high-quality door hinge designed for durability and functionality. Made from cold-rolled steel, this hinge strength and reliability for everyday use. It features a 5/8 inch radius and fits standard hinge cutouts, making it easy to install. The closing speed and tension are both adjustable, allowing you to customize the door's operation to your preference. Additionally, this hinge is UL for fire doors, ensuring safety and compliance with fire regulations. Model Number: V522