National 4 In. Square Oil Rubbed Bronze Spring Door Hinge is a versatile and durable door hinge designed to provide reliable performance in a variety of settings. This hinge, part of the V520 series, features adjustable tension to customize the closing speed according to your needs. It is listed for fire-rated openings, making it suitable for both residential and commercial applications, including industrial and institutional environments. Crafted from cold-rolled steel, this hinge ensures long-lasting strength and durability. Its design includes square corners and fits standard hinge cutouts, making installation straightforward and compatible with most doors. Model Number: V520