National Hardware 4" Square Satin Brass Spring Door Hinge is a versatile and reliable choice for both residential and commercial applications. This catalog model V520 series square spring door hinge features adjustable tension and is listed for fire-rated openings, ensuring safety and functionality. Crafted from durable cold-rolled steel, it a sturdy construction that fits standard hinge cutouts with its distinctive square corners. The closing speed is also adjustable, providing smooth and controlled door movement. This hinge is ily suited for industrial and institutional uses as well, making it a practical addition to a wide range of door setups. Model Number: N184-572