National 3.5 In. Satin Nickel 5/8 In. Radius Spring Door Hinge is a high-quality door hinge designed for durability and functionality. This hinge, identified as National catalog model No. V522, features a 5/8 inch radius and is crafted from cold-rolled steel for long-lasting strength. It adjustable closing speed and tension, allowing you to customize the door’s movement to your preference. The hinge fits standard hinge cutouts, making installation straightforward. Additionally, it is UL for fire doors, ensuring safety and compliance with fire regulations. Model Number: V522