Product review (3 stars): Too small for my dish rack, but they can be made to work with a lot of effort
They may work well on dish racks with small wires, but it takes about 3 to 5 minutes to attach each cap to the dish rack tips in our Whirlpool. In order for them to fit I first have to puts them on a Philips screwdriver and heat them to make them soft and stretched. Once they are properly stretched I have to squeeze them over the dish rack posts until they are seated properly. I can only do a few at a time before my fingers hurt. So far I have 20 posts capped.

The concept is great. Be sure to check the size of your dish rack wire posts, though. If they have bulbed tips (like mine) instead of straight posts, you either have to prepare for a lot of work or look for a different size. I wish I knew where I would find some with a diameter about 1 mm larger.