The Access Tool box Tonneau Cover is built to fit behind most 19-21” over-the-rail toolboxes. This increased capacity tonneau cover with tool box design means you have extra protected storage in the truck bed without losing entry to your existing tool box. The Access Tool box Tonneau Cover operates independently from the toolbox and will not interfere with operation when loading or unloading items. Simple operation, easy installation and superior performance are what separates the ACCESS® Roll-Up Covers from other tonneau covers. This tool box tonneau cover works without obstructing the toolbox so you can get at your tools without having to open the cover and still safely protects the cargo you have stored beneath. Engineered to perform in extreme hot and cold climates, the Access Tool box Edition Truck Bed Cover will protect any gear you throw under the pickup bed cover.