National 4 In. Oil Rubbed Bronze 1/4 In. Radius Spring Door Hinge Stringliner robotically welded and mechanically descaled

robotically welded and mechanically descaled for a perfect fit

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grounds keeping

National 4 In. Oil Rubbed Bronze 1/4 In. Radius Spring Door Hinge Stringliner robotically welded and mechanically descaledCatalog model No. V521 series. Cold rolled steel. Designed for hanging self closing doors in basements, stairways, garages, and entrances. Can be used in residential, commercial, and apartment buildings. Hinge is UL approved for fire doors. Closing speed is adjustable. Fits standard hinge cutout. 1 4' radius, round corner automatic door closing spring hinge.