This is used for washing small items in the dishwasher, and it has a fastener to prevent them from falling into gaps. I think it's convenient for washing bento box food cups and water bottle gaskets. I bought it because I thought it would be useful, but I haven't had a chance to use it, and it's been sitting in the drawer under the sink. It's a new, unused item, but it has been stored at home. I would appreciate it if you could understand. Size: Approximately 17 cm in diameter Approximately 5 cm in height. Thank you.