Pages are held together using screws and interscrew binding is not just used for books - it can fasten together furniture, athletics helmets and more. Interscrew binding allows your book to function in different ways. You could have 1 screw post creating a hinge movement, which is great for swatches, or multiple screws for a sturdy binding. As the pages can be rearranged, added or removed, it is ideal for portfolios.
We use either solid brass or nickel plated posts to secure the pages.