National Hardware 4" 1/4" Radius Brass Spring Door Hinge is a reliable and durable solution designed for hanging self-closing doors in various settings such as basements, stairways, garages, and entrances. Crafted from cold-rolled steel, this hinge is suitable for residential, commercial, and apartment buildings. It is UL for fire doors, ensuring safety and compliance. The closing speed of the hinge is adjustable, providing convenience and control. It fits standard hinge cutouts and features a 1/4" radius round corner design with an automatic door-closing spring for smooth operation. Model Number: N185-207