The Nordic Ware Nonstick Universal Double Boiler is a lightweight aluminum insert designed to fit any 2- to 4-quart saucepan, making it easy to melt chocolate, temper candy, or prepare silky custards and sauces with gentle, indirect heat. With an 8-cup capacity and a smooth nonstick interior made without PFAS, this versatile double boiler delivers even heating and effortless cleanup.