Product review (4 stars): Works as described.  Keeps the water in the dishwasher instead of the floor.
It's amazing how well these things works, although, it's also amazing that any dishwashers have a design that requires these things.  So, the way they work, is that the little white tabs that stick out from the right (in the picture) are supposed to be bent a little, and then you tuck the bent portion under the dishwasher seal, which holds it in place (sort of).  You just have to make sure the dishwasher seal is in securely, otherwise these things could potentially fall out.  Our previous dishwasher didn't have the seal to hold it in place, so we needed to order that too (it was a dishwasher that was preinstalled in our home when we purchased), but since using these, we haven't had a drop of water on the floor.

Giving 4 stars as they work as they're supposed to, and if you have the issue where you need them, it's a no brainer.  Knocking it down 1 star as there's no reason that these should cost more than $2 + shipping.