Zerust 11321 is a vapor capsule that prevents rust and corrosion for up to a year. It creates an invisible vapor shield around metals like aluminum, brass, copper, iron, steel, and silver, protecting them from rust. Place the capsule inside toolboxes, utility drawers, tackle boxes, knife drawers, tool cabinets, truck boxes, golf bags, garage cabinets, and basement storage locker containers to prevent rust and corrosion.