These ceramic shoes for grills work well in raising the grill above the area it was placed to allow air flow under the grill. So you can place it on combustible material or built-in even outdoor application Ceramic grill feet(pack of 4) can raise the grill approximately 1 inch.And if you lose one of them ,dont worry because you can stand your grill just with three This colourful accessories parts fit for a lot of ceramic grill such as Primo,BGE,KJ.The black shoes especially fit for your KJ or primo Heat insulation to prevent floor damage, moi