Product review (5 stars): Good product, Good seller!
This stacking kit amounts to some small metal tabs that lock the upper and lower unit together plus some strips of padding that cushion the dryer and stop it from scratching the top of the washer. Pretty simple and easy to use - plus its needed if you plan to stack your washer/dryer to make sure the dryer doesn't shift.  I was planning to stack mine until my wife had other plans - plus I'm not sure this was the right kit for my model washer/dryer even though the description said it was - it didn't look right. Anyway, I returned it unopened and the seller promptly refunded all of my purchase price.