This is a Revere double boiler insert designed for use with the 1930s through 1970s vintage Revere Ware copper-clad saucepans. It will fit a 3, 3-1/2, or 4-quart deep saucepan, or any pan that is 7" to 7-3/8" diameter and at least 4-1/2" to 5" or more deep. The stainless steel insert measures about 9-1/2" handle to handle (just over 7-1/2" without the handles) and is 4" deep. The insert is shown in the last two photos with a 3-1/2 quart saucepan (not included).
The stainless steel finish is in excellent condition with some typical marks in the bottom from use and cleaning. The dark spots in the photos are from glare and shadows.