High-quality materials: Made of high-quality iron, the book screws offer excellent scratch, corrosion, and wear resistance, ensuring a smooth surface and structural integrity. They feel smooth to the touch and are durable, ensuring reliable function for years. Easy assembly: Deep, even threads grip securely and non-slip, while the flat head lies flat and provides a polished finish. The included tools allow for quick insertion and removal, making even complex assembly easy. Proper storage: All book screws come in a transparent divider box that neatly separates the individual sizes. Lightweight yet robust, they are perfectly suited for shelf storage, a toolbox, or for use in the field. Versatile applications: Ideal for binding documents, photo albums, menus, brochures, and recipe books, or for decorating leather goods such as handbags, belts, and hats. Also ideal for craft projects, keychains, calendar components, and personalized stationery. Comprehensive set: this 110-piece set consists of six sizes: 20 M5 x 4 mm, 25 M5 x 5 mm, 20 M5 x 6 mm, 15 sets M5 x 8 mm, 15 sets M5 x 10 mm, and 15 M5 x 12 mm – as well as a precision screwdriver and a punching tool. With this, you can handle all binding tasks.