All in one Firebox UpgradeEasy grab handle makes pulling this firebox in and out super easy! Integrated ash pan prevents hot ash and charcoal from landing on your patio or lawn. Air Channels under the Firebox allows the proper amount of air flow around the charcoal for the best fuel efficiency. We use thick materials upwards of 1 4" thick and our base plate is laser cut metal (NOT EXPANDED METAL THAT WILL BURN THRU that other manufactures use) Things to note: *Cannot be used