If you plan on putting any normal amount of material in these hanging folders don't bother they will fall apart on you. I've had to staple nearly every folder to keep the folders from coming unglued and the metal rod in place.
I bought this particular box because it was the cheapest one available in the store. Well when I went to set up my files I noticed that it was very difficult to insert the plastic tabs into the slots because many of the slots were not pre-cut very well. I would not recommend this product.