Strong & lightweight aircraft grade aluminum cargo plate. Powder coated. 13.35" wide x 12.25" long (narrows slightly toward the back). Use this Cargo plate to strap down a duffle bag or combine with the Caribou DIY top case mount hardware and a case (available separately). Oval slots machined into the perimiter for tie-downs. Bolt-on system, no drilling or modifications required. All bike-specific mounting hardware provided.