High-quality nickel-plated Chicago screw kit. Thread size: 4 x 5 mm (D x L); total length: 28 mm. Material description: Made of high-quality metal, advanced nickel plating, rust-resistant, effectively improves corrosion resistance and decorative effect. Wide application: Particularly suitable for leather craft decoration, documents, books and albums, etc., and binding. Packaging box: Easy to use and store.