Unicook Porcelain Large Grill Heat Plate 4 Pack, 6'' Extra Width, Extends from 15.75" to 18.75" Length, Adjustable Grill Heat Shield, Heat Tent Replacement Parts for Gas GrillsThis 6'' extra wide heat plate that can be adjusted from 15. 75" up to 18. 75" length. 24" wide firebox requires 4pcs heat plates, 30" wide firebox requires 5pcs heat plates. Protect burners and prevent flare ups, prevent direct exposure to flame and distribute heat from burner tubes to cooking grates evenly. Heavy duty porcelain coated steel construction, thickness of porcelain steel is 1. 2mm, more thicker than others. Hardware included, easy to