National 4 In. Square Satin Nickel Spring Door Hinge is a versatile and durable door hinge designed for both residential and commercial applications. This catalog model V520 series hinge features adjustable tension, allowing you to control the closing speed to suit your needs. Made from cold-rolled steel, it is built to last and is listed for fire-rated openings, ensuring safety and compliance with building standards. Its square corners and design fit standard hinge cutouts, making installation straightforward and seamless. I for a variety of settings including industrial and institutional uses, this hinge combines functionality with a sleek satin nickel finish for an attractive appearance. Model Number: V520