GrillGrates concentrate and even out the heat of your F-20 or Forge 15. They are additive to the cooking process via patented raised rails that are heat injectors and contribute to precision searing.GrillGratesimprove the grilling experience and deliver juicier,more tender food.GrillGratesare reversible interlocking panels, giving you two grilling surfacesin one;grillrails up orgriddleon the flat side. Constructed from hard anodized aluminum,GrillGrateswill never rust. Made in the USA.