Installs on 22.5" kettle grills to make a superior pizza cooking surface * Openings on sides allow easy refueling, firebox in rear allows extra heat to circulate in grill dome * Works with 22.5" kettle grills and 22.5" Kettle Pizza inserts such as KPB-22 * Cooking grate is 304 stainless steel, tombstone shaped pizza stone is made of 5/8" cordierite * All components proudly Made in USA with the highest grate materials