STRONG AND DURABLE These silver chicago screws are made of a strong aluminum metal that won't scratch or chip. They help you quickly and conveniently bind together loose pages of any size or hole configuration, allowing for easy editing as often as needed. You can even expand the capacity by adding extensions if your document grows. WEAR AND CORROSION RESISTANCE The shiny silver finish on these screw posts exudes excellence and professionalism. High hardness durable and non-rusting, not easy to rust in a moisture environment, antioxidant. WIDE APPLICATION With silver aluminum chicago screws, you can quickly and simply bind documents of any kind. Great for holding together groups of paper, cards, swatches, photo albums, point of purchase displays, menus, scrapbooking, etc. EASY TO INSTALL Convenient to use. They feature two pieces: a screw and a post. These pieces are easily screwed together, making it incredibly fast and easy to edit your document as-needed, and as many times as required. HIGH QUALITY MATERIAL Made of high quality carbon steel, uniform coating, high hardness and with beautiful appearance, round and smooth, sturdy and durable, to give good luster. Each post is made from heavy duty aluminum which makes them useful for a number of projects.