Clips securely onto the top of the Folding Firebox camping stove, converting the Firebox into an efficient boiling system to be used with a 40oz stainless steel water bottle, or any of the stainless steel or titanium space saver cups which fit over the end of a thirty two ounce Nalgene water bottle. The Boil Plate boxes in the burn chamber concentrating heat around the cookware, allowing you to boil or cook with a very small fire using very little fuel.