5 different sizes for your interest: The binding screws are 5 lengths: 6 mm, 10 mm, 12 mm, 15mm and 18mm, all the fixing screws have a diameter of 5 mm which adapts to most objects high quality: screws are made of quality carbon steel, plated with silver nickel, robust and anti-rust, easy to bind, install and remove, these chicago nest can be used repeatedly with a good sealing Wide application: Screw rivets are particularly suitable for leather craft decoration, binding, document, book, album, DIY crafts, etc. Easy to install: Just use a drill to make a 5 mm diameter hole, and install the 2 pieces on each side Practical Storage: We offer beautiful plastic storage boxes. So, you do not have to fear losing some rivet screws, so you can use them again Features: 1.Fabricated in quality carbon steel material, silver, robust and anti-rust nickel plated. 2.Reuse: Easy to remove, install and remove; Can use repeatedly. 3.Ideal for the decoration of leather crafts, binding, document, book, photo album, scrap booking, do-it-yourself , etc. 4. Organized by size in a seamless storage case for quick access and protection. Specification Product name: screw Color: Silver The package includes: 16 screw games (5 x 6 mm) 16 screw games (5 x 10 mm) 16 screw games (5 x 12 mm) 16 screw games (5 x 15 mm) 16 screw games (5 x 18 mm) Screw 80pcs