Product review (3 stars): Ok, but metal parts are much better.
This product will fix the issue that happens all too frequently where the locking plastic wears down that holds the wheels onto the rack. This means the rack will not stay on the track. While this is an adequate replacement, I highly recommend the full metal version that is also sold on Amazon if you dishwasher is only a few years old. (If you only expect to keep a year or two, this one will do the trick just fine.)