National Hardware Spring Hinge, 30 lb Weight, Door Leaf Height: 3-1/2 in, Frame Leaf Height: 3-1/2 in, Pin Type: Removable, Wall Mounting, Number of Mounting Holes: 6, Steel, Brass, Dimensions: 3-1/2 in L x 3-1/2 in W, Suitable for: Hinge Cutout and Fire Doors Up to 3 ft x 7 ft
