National Hardware N184-572 Spring Hinge 4 in H Frame Leaf Steel Brass Removable Pin Wall Mounting 37 lb

National Hardware Spring Hinge, 37 lb Weight, Door Leaf Height: 4 in, Frame Leaf Height: 4 in, Pin Type: Removable, Wall Mounting, Number of Mounting Holes: 8, Steel, Brass, Dimensions: 4 in L x 4 in W, Suitable for: Hinge Cutout and Fire Doors Up to 3 ft x 7 ft