Set of 3 small aluminum cases with windowed lids Diameter: Approximately 18mm Height: Approximately 13mm I believe I purchased these over 10 years ago at a flea market where an artist was selling materials and supplies. I used them to display small dried materials like berries. They are not airtight containers. Some lids are a little loose, while others close securely. I bought them without knowing their original purpose, but after searching for information for this listing, it seems they were originally used to store old watch parts. How about using them to store small parts? They were used when I purchased them, so they have scratches and signs of wear. Please understand. If you have any questions or would like to see specific areas, please feel free to comment. Antique tools Aluminum case Watch parts Small items