OK Everyone, I finally got some results. (I've been busy, sorry) I tried these swivels, and I could NOT get them to break! ! When I attempted to do a pull test on them, all I managed to do was get the loop, where you lure would be hooked up, NOT to open. Instead of coming open, the wire "cross lock" slid down the wire forming a very small loop at the bottom. BUT, It did NOT come open ! ! ! I tested these buy, placing the snap (lure end) over a nail, and exerting approx: 100# of force on them. And instead of opening or breaking apart, the wire simply reformed itself into a smaller loop. I feel pretty good about these, and I will be using them on my boats tis year. I hope this saves some money for you guys. Bill.