Product review (2 stars): Poor quality
These are of poor quality.  The coils are only attached to one of the three cross bars, so they wobble.
Today I went to Home Depot to look at the replacement coils that they offer.  The coils are attached to all three crossbars offering much more stability.  They are much more expensive at Home Depot.  So if you want the higher quality ones, then you must pay more money.  There is a reason these ones are much less than the alternatives.