Product review (2 stars): Not safe, sorry
This particular size is wobbly.  I do not understand it either.  Our Kenmore drop in range needed some new ones however, these are unstable.  The number of turns is different, and likely since this one has more circles, the metal is smaller and hence moves under the weight of a full size skillet.  I didn't notice it so much when we had the canner on board full of quarts of tomatoes?  I can't keep my bacon and eggs on these to save my life.  So I'm looking for Kenmore or Whirlpool OEM stuff to replace these.  We also bought the smaller 7361's replacing all four, the are okay.  Great price and they do work, hence the two stars I can honestly post.  Cheers and happy cooking.