This size fits onto the fire-base of the 'Base Camp' & 'Scout' Kettles. Safe, easy and fun to use: Creates stable cooking surface for pot or fry pan and the fire is safely contained within the unit. Fuel efficient: Heat is directed toward the pot or fry pan on the top. Works in all weather conditions. Uses any solid fuel. Compact: Packs away inside the Kelly Kettle fire-base Durable: Made from stainless steel Use anytime with or without the Fire Base when you need a surface for cooking. Simply place the Hobo Stove on the ground and build the fire inside While the Hobo can be used on an aluminium fire base, you run the risk of overheating the aluminium and ruining that base. We recommend the Hobo Stove accessory be used with our Stainless Steel bases. Our 350ml cup, fits inside the 500ml cup, which fist inside the large cook set, which fits inside this Hobo Stove, which fits inside the fire base (Base Camp or Scout) which inverts up into the kettle ..... really compact storage!!