This is an adapter used when the size of a "seiro" (steamer) and a "nabe" (pot) don't match. Inner diameter of the pot: 24cm Outer diameter of the Chinese steamer: 10cm - 21cm This is a receiving stand for Chinese steamers with an outer diameter up to 21cm. It can be used with a pot with an inner diameter of 24cm. (If the pot doesn't have a handle, it can also be used with a smaller pot. It's like the image in the 5th photo.) Material: Aluminum Type: Steamer For a pot with an inner diameter of 24cm, receiving stand, pedestal, steamer plate, steamer basket, Chinese steamer