Once these brackets are installed on a Front Runner Rack, no tools are needed to remove or install a cargo box. Simply release the tabs on the 4 latches and lift the roof box away in seconds. This strong and rattle-free mounting system is built off-road tough for use with Front Runner Racks. Also compatible with Thule, Yakima, and other popular roof cargo boxes. Secures in place with 4 latches with safety catches. The brackets are small, unobtrusive, and can be left on the roof rack when your cargo box is not mounted, leaving vast rack space available. No modification is required. Supplied with all required mounting hardware. Fitting instructions are included.