This double boiler insert from All Clad measures 8" x 3-1/2" and fits 3 & 4 quart sauce pans. The thick sides and base will help to melt chocolate and warm delicate sauces without scalding.The stainless steel collection features a magnetic stainless exterior for use on conventional and induction ranges. The cooking surface is hand-polished 18/10 stainless steel that will not react with food. The inner core is pure aluminum from the base to the sides. The three layers are bonded together for optimum heat conductivity.All Clad's stainless collection features long, stay-cool handles, non-corrosive rivets, and sure-fitting lids, all made of stainless steel.All Clad stainless can be used with any type of utensils and is dishwasher safe.