Product review (3 stars): Dishwasher has a design flaw, these are the parts needed to keep it under control
We have a Samsung dishwasher with an adjustable upper rack.  It holds the rack with two assemblies, each holding the rack with three clips.  These clips don't tolerate the heat and chemicals of a dishwasher very well, and break off - that's bad for your dishwasher pump motor.  So, it's a good idea to replace these adjusters twice a year - before the clips break.

Amazon has a nice price.  But, it's still a pain, and a bad design overall.