"This small, unassuming tool doesn't look like it would separate almost any two Lego pieces that have become stuck too tightly together, but I have not had it fail yet. I wish it had a keyring or a hole in one end. We have a tendency to lose ours at the most inconvenient times. If we were able to hang it up on nail or a hook (maybe a suction hook in the playroom cabinet?) a few tears would have been avoided. Every super-sized set or multi-set Collection should come with one of these. Lego should be more careful to make sure the instructions on how to use this tool accompanies it."