Haven't tried yet but have seen my wife's uncle catch large trout with them.
So far I have not used them yet. But I like the way they look. Will update this report after I used them this weekend
These pliers are just the ticket for applying the small o rings to trick worms or smaller drop shot sized worms. You can’t get the smaller o rings on the normal size tube used to put on the larger rings. Outstanding and essential tool for the box.