Yes they divide, but resulting compartments are tight
Your review: They do exactly as you might expect, there is no fault in the product. However, using these in the bins does result in deep sections that are hard to easily grab small items from. Since you probably used these for small items, that's an issue.
Instead, I like using the small bins (search on "little bin" on this site) inside the regular sized shelf bins. The small bins can be removed, labeled, handled easily and are useful out of the shelf bin as well as in.
You may still have use for one set of these dividers in long shelf bins, but you probably won't use lots of them.