Extends from 11.75” up to 21” long, 3.75” wide, fits most gas grills. If installed reversely, the length will be extended from 11.75” to 18.37” onlyPrevents flare-ups and protects burners to prolong life, prevents direct exposure to flame and distributes heat evenlyReplaces heat tents for side-to-side and front-to-back burners. Upgraded Stainless Steel M5 bolts and wing nuts are included, easy to installThickness of porcelain steel is 1.2mm, heavy duty porcelain-coated steel construction; Thicker is better; longer lastingStainless Steel version is also available, click the "UNICOOK" button (top middle of the page) to get more details about the S/S version