Feature:1. Uniform Coating: The nickel coating is uniform and dense, with high hardness, and the coating can be heat treated to improve its hardness.2. Brass Material: The book binding screw is made of brass material, smoother surfaces without burrs, exquisite workmanship, strong and durable.3. Beautiful Surfaces: The bookbinding flat head stud screw has a fine gloss, is hard and thick, and has no oil stains on the surfaces.4. Not Easy to Fade: The surfaces of Chicago screws flat head stud screw is electroplated, not easy to fade.5. Beautiful Durable: Metal Chicago binding screws are well made, beautiful and durable, and the quantity is sufficient to meet the needs of use.Specification:Item Type: Book Binding ScrewMaterial: Brass.Package List:120 x Book Binding Screw(Sets)