The Extang Express ToolBox Tonno is made to fit most standard 20 in. tool boxes. It is engineered with exclusive features that provide instant truck bed protection with top-notch looks and superior performance. The Express Tonno is the most convenient and easy to use roll-up style tonno in the industry. Its revolutionary components provide a secure, no-nonsense installation in just minutes! All-weather tapered tarp design repels water for protection from the elements while offering increased gas mileage.