Yup they are called "barbers hones" and vary considerably in performance and price/value.
The greatest advice I have heard is "try it and see how well it works for you". That said, you need a fair bit of understanding of what they do and what to expect.
Typically they behave as a medium to fast abrasive (for carbon steel straight razors) in the 2000 to 6000 grit range (they are notoriously variable by brand/vintage). For knives, this would generally be a fairly high finish and not very well suited to many modern blade steels.
Regardless, it's a neat piece of history that many blade fanatics would want on their shelf (perhaps only for display).