National 3.5 In. Oil Rubbed Bronze 1/4 In. Radius Spring Door Hinge ClimaPlus Cold-rolled steel

Cold-rolled steel

Easy placement or removal of convEGGtor

Knockouts: Round 1" diameter

Key can be duplicated using a high security key cutting machine

Easy-to-find buttons

National 3.5 In. Oil Rubbed Bronze 1/4 In. Radius Spring Door Hinge ClimaPlus Cold-rolled steelCatalog 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.