Here is 1 Double Boiler Inset in the Revere Ware 1801 pattern in glossy stainless steel. It is 7 inches in diameter in the center, 9 3/8 inches across the wings, and 4 inches high. It fits a pan that is 7-7 1/4 inches in diameter across the top. Because this is 4 inches high, this will only fit into a 3 quart sauce pan.  Please measure your pan. It is in very good condition. It shows expected wear and scratches from age, cleaning, use and stacking. Please look at the pictures. This will be packaged well and shipped ground advantage. Thanks for looking!