About This Product National Hardware Spring Hinge, Door Leaf Thickness: 0.056 in, Frame Leaf Thickness: 0.056 in, Pin Type: Removable, Surface, Wall Mounting, Mounting Hole Diameter: 3 mm, Cold Rolled Steel, Brass, Dimensions: 3 in W, Suitable for: 3/4 to 1-1/4 in Thick Doors, Includes: Screws Highlights Double-action, self closing, provides two way access for swinging doors Tight pin is adjustable to provide desired closing speed for a variety of swinging-door applications Cold-rolled steel hinges with a decorative-plated finish have the added protection of baked-on lacquer, which helps retain the original beauty under ordinary condition However, exposure to moisture, strong cleaning solutions, paint remover or other chemicals may break down the protective coating and cause the finish to fail (2PK 3" DBL Spring Hinge - 7154685 - N115-303)