Product review (5 stars): Stay on pretty good without glue
I have an old apartment dishwasher, and the prongs had worn away and were destroying my pans. I didn't want to bother with glue, so like other reviewers, I just stuck these on without glue.  Most of them stay on just fine, a few come off and become lost down the drain, and I've replaced them each time. I have to replace fewer and fewer each wash cycle, and now they only come off if a pan catches them as I'm unloading the dishwasher. I'm betting even that will stop being a problem after a while.

I don't know if they sent me extra like other people said, since I didn't count mine and bought 100 for the 58 prongs I needed to cover, because I wanted extras in case some day I want to cover the prongs on the top rack (which are still in okay shape).

Edit: a few months after I originally wrote this review, none of them come off anymore. I'm not sure I could get them off if I tried. Even when pans catch on them they stay put.