These metal screw posts are popular solution for quickly binding stacks of leather, fabric, rubber, metal and more. They are extremely easy to put together and take apart, and require no machines or special training to use. The two pieces of a binding screw are easily attached and detached as-needed by simply screwing them together or apart. This easy binding method also makes them a great choice for leather crafting projects, photo albums, swatch books, blueprints, engineering drawings, and much more. Also commonly called Chicago screws or Chicago screw posts.