Inner dimensions of the pot (frying pan): 16.5cm, lid: 18cm. Compatible with all heat sources. Trivet: 12.5cm. Masher: 30cm. Slotted ladle: 20cm. Skimmer: 20cm. The pot, lid, and trivet are new. The trivet is used to stabilize small or lightweight items on a gas stove, but it can also be used as a trivet (pot stand).