The American Outdoor Grill (24-B-37L) replacement main burner large knob is constructed of durable 304-grade stainless steel, fits all American Outdoor Grill L-Series gas grills (any size). To install, simply detach main burner control knob by pulling directly out and replace with new. Installation takes less than 1 minute. Sold individually. 24-Inch AOG Grills require two(2) main burner knobs, while the 30-inch and 36-inch models require three(3) main burner knobs.