The Black Middle Section for Chartpak Expand-A-Tube Storage System offers maximum functionality and versatility to any basic tube. By interlocking one or more middle sections, it provides storage tubes additional length to accommodate all documents of any size. Each middle section measures 12 inches in length and has inside diameter of 3 ½ inches.
Ideal for mailing, storing, and transporting drawings and other large-format materials, it is water-resistant and ultraviolet light-proof providing ultimate protection to its contents. It is made of virgin high-density polyethylene material that is durable and strong. Its lightweight construction ensures convenient handling. It comes in black color.