With one twist of the wrist these black plastic tubes telescope from a fully closed 24 in.length to a fully extended 39 in. length. Innovative twist lock design enables you to lock the tube at just the length you want. An ideal solution for safely storing and transporting blueprints, posters and virtually anything that can be rolled, these tubes feature a 3 in. inside diameter and fully adjustable shoulder strap. Screw cap closes tightly and includes a clear plastic cover that lets you easily label and relabel each tube’s contents.