Screw posts (often referred to as Chicago Screw Posts) are a great choice for binding photo albums, swatch books, scripts, architectural blueprints, engineering drawings, or any application where loose sheets need to be kept together. Binding with screw posts allows for easy editing without damaging the bound materials. Removable aluminum fasteners consist of two pieces (screw and post) inserted into round hole punched paper and covers. Need more capacity? Add screw post extensions to the posts to extend the length of your binding posts.