Product review (3 stars): A necessary evil
These little clips slide onto rack posts and clip into place where they will no doubt break again due to their abysmal design.  Also note that there are plastic rail inserts that must be removed to slide these in that unless you are an experience repair technician or a mechanical engineer, you will destroy. I recommend you buy two sets of these rail inserts because you will fubar at least one leaning how to put them back in.