National Hardware 3-1/2" Satin Nickel 1/4" Radius Spring Door Hinge is crafted from cold-rolled steel and designed specifically for hanging self-closing doors in areas such as basements, stairways, garages, and entrances. This versatile hinge is suitable for use in residential, commercial, and apartment buildings, ing reliable performance across various settings. It is UL for fire doors, ensuring safety and compliance. The closing speed of the hinge is adjustable, allowing for customized operation to meet your needs. Featuring a 1/4" radius with round corners, this automatic door-closing spring hinge fits standard hinge cutouts for easy installation and seamless integration. Model Number: N350-835