Product review (2 stars): If you are ordering one or two, you can ...
If you are ordering one or two, you can just skip that idea because the other ones are going to break within a month.  Trust me. This is the second time I have had to replace the wheel assembly units in four years.  It's not the sellers fault that Whirlpool makes these so poorly - hence the two stars.  Once you have replaced all four, every time you push in that bottom rack, you need to pretend it is a stroller with a newborn baby in it - one made of really fragile glass.  Then, they MIGHT last for more than 18 months.  Just sayin.