Why I recommend Aeroquip. XRP is a true aircraft cutter style end which some people don't like to work with, even though it is probably a better design and is more expensive. Summit? Who knows where that comes from. And the old Russell stuff was awful. No clue what the current stuff looks like. Earl's makes nice stuff and offers both styles, but I don't have any here to measure.

Interesting that I haven't been able to find any of these specs in anyone's information online.