National Hardware 3-1/2" Square Satin Brass Spring Door Hinge is a versatile and reliable door hinge designed for both residential and commercial applications. This catalog model V520 series square spring door hinge features adjustable tension, allowing you to customize the closing speed to your preference. It is listed for fire-rated openings, ensuring safety and compliance in various settings including industrial and institutional environments. Made from durable cold-rolled steel, this hinge fits standard hinge cutouts and is crafted with square corners for a clean, modern look. Its satin brass finish adds an elegant touch while providing long-lasting performance. Model Number: N184-556