Different Sizes for Your Interest: The binding screws are 5 lengths: 6mm, 10mm, 12mm, 15mm and 18mm, all Chicago fixing screws have a diameter of 5mm which fits most items High Quality: Chicago screws are made of quality carbon steel, plated with silver nickel, sturdy and rustproof, easy to bind, install and remove, these Chicagonest can be used repeatedly with a good seal Wide Application: Screw rivets are especially suitable for leather craft decoration, binding, document, book, album, DIY crafts, etc. Easy to install: Just use a drill to make a 5mm diameter hole and install the 2 parts on each side Convenient Storage: We provide beautiful plastic storage boxes. So you don't need to be afraid of losing any rivets, so you can use them again 80pcs 5 metal sizes binding screws are made of carbon steel, which is solid and durable, with nickel plated surface. Kit 5 sizes head screws are ideal for leather, craft decoration, decorate a document, book, photo album, binding, scrapbooking and other DIY crafts. Features: 1.Made of quality carbon steel material, silver, sturdy and rustproof nickel plated. 2.Reusability: Easy to remove, install and remove; Can be used repeatedly. 3. Link: 5 different sizes, 20 pieces for each size, 100 sets binding screws in total. 4.Ideal for decorating leather crafts, binding, documents, book, photo album, scrapbooking, DIY, etc. 5. Organized by size in a seamless storage case for quick access and protection. Shipping Color: Silver Dimension: 5 6mm / 5 10mm / 5 12mm / 5 15mm / 5 18mm Quantity Shipped: 1 Box