ACCESS TOOLBOX Tonneau Cover - 65239Exclusively from ACCESS(R) Original Roll Up Cover comes a tonneau cover that is both versatile as a handyman and dependable as the tools he uses. The ACCESS(R) Toolbox Edition Roll Up Cover works with 19 to 21 in. over the rail toolboxes and operates independently of the toolbox without interfering with its operation. And it is engineered to perform in extreme hot and cold climates, so it will protect whatever you throw under it. Fits Most 20 in. 21