I have no idea what Ikea called these, but they were a cabinet accessory that we used to stand sheet pans on their side for better storage/easier access. I'm sure you can find 1,001 creative reuses for them.
To claim:
1. Check the map for approximate location
2. Tell me when you would like to pick it up
3. I will confirm, provide the address, and leave it on my porch for you at the appointed time
Contact me at 859-4373 or email via the Craigslist reply link above. (Yes, I think you are clever enough to put the right area code with my number.)