"Two piece", porcelain coated steel cooking grate set for Weber Genesis Silver B/C, Platinum/Gold and Spirit 300 Series (model years 2007-Current) model gas grills. 50/50 Split, with each section measuring 11-3/4 inches wide by 17-1/4 inches front to back, for a total overall set width of 23-1/2 inches. Aftermarket Part.