Product review (2 stars): To small, and inflexible
I bought this caps because many of my prongs were split and starting to rust.  I was excited when they arrived and started to put them on the rusty or split prongs.  As I started to slide on the first one, I realized that it didn't fit.  I pressed harder, then as hard as I could.  Still it would not go on.  I got one or two on after some serious effort.  Now, over a month later, they sit in the cupboard tool bucket, taking up space.  I should have returned them and looked for a larger size, but didn't feel it was worth it.  I am planning to have another round at it, by using a hammer to force it on, maybe I'll update the review if that is successful.  It may work for you as a preventative measure, but if yours are already split, bloated, or rusty, then this product will not help you.  Unless dishwasher prong sizes vary widely by manufacturer, and you feel yours are exceptionally small, I would look elsewhere.