The All-Clad stainless double boiler insert is conveniently designed to fit in your 3 or 4 quart All-Clad sauce pan. By placing it over gently simmering water, you'll gain optimal temperature control of delicate ingredients, such as egg and cream mixtures for creme brulee. The 18/10 stainless steel surface heats quickly and evenly so you achieve desired consistency and results. Confidently melt chocolate or prepare a restaurant-quality zabaglione. The cooking surface doesn't react with foods, so your food retains its natural flavors.