This is a two-tiered bamboo steamer. It includes an extra tier to add height. Inside diameter: Approximately 19.5 cm Outside diameter: Approximately 21 cm The items for sale are: Lid 2 tiers + 1 height-adding tier Steamer paper (looks like 20-30 sheets) The box says "Includes a 26 cm steaming plate," but this means it is compatible with a 26 cm steaming plate. However, the steaming plate is NOT included in this sale. I wanted a 26 cm steamer and purchased this online, but the steaming plate was 26 cm and the steamer itself was smaller. I made a mistake with the size. Therefore, it has been opened but is unused. Thank you. - Type: Steamer - Material: Bamboo - Size: Two-tiered - Design: Woven design - Accessories: Instruction manual Thank you for looking.