As others stated, trigger is too small, opening does not allow easy passage of closure ring. Nice light weight, but difficulty using it outweighs any positive.
I was really disappointed in these clasps because I liked the size and he price, but the trigger is really difficult to maneuver if you are clasping a bracelet on yourself. I always test out my designs myself before I give them to my customers and I won't be purchasing this one again. It would be better suited for a child's bracelet that would require Mom or Dad putting it on the child.