Product review (3 stars): Good, but small.
These are good for protecting the tips of your dishwasher rack to prevent corrosion and rusting.  They fit very, very tightly on my Whirlpool Dishwasher.  They were a little hard to put on, and I think they would be impossible to put on if the tips were already damaged or corroded.

For tips that were already damaged, corroded or rusted, I used UberGoop and the tips which came with it, which are a little larger and thicker, and easier to put on even with the "Goop" applied to the tip.  These have held up well, too, through many washings.

Even without using any kind of adhesive underneath, I have only had one come off, and then just once.  I'm not sure if it came of in the dish washing cycle or if I did something to loosen it.  The price was great.