Screw posts (often called Chicago screws or Chicago screw posts) are a great choice for binding photo albums, swatch books, scripts, architectural blueprints, engineering drawings, and more. Binding with screw posts allows for easy editing without damaging the bound materials. Need more capacity? It is easy to expand the existing screw post capacity by simply adding screw post extensions. We offer Chicago screw posts in aluminum and plastic in a variety of colors, as well as in steel for heavy-duty applications.