Screw posts, also known as Chicago screws or book binding posts, are extremely versatile binders that allow loose documents of practically any shape or size to be securely bound . These low-cost, reusable Chicago screws enable you to easily change out bound documents, making them a great choice for price books, menus, books, architectural and engineering drawings, and much more. CintBllTer's high quality, black-colored aluminum screw posts provide an easy-to-use alternative to other binding methods at an exceptionally low price point. Their two-piece construction allows for no-fuss updates, which is why they're an ideal choice for applications that require frequent updates. They are also easy to expand, with a number of screw post extensions readily available.