Used this when putting the new Sunstar 520SSR chain and new sprockets on my LTZ400. Was a very good fit, and seems exceptionally secure. Keep in mind that with O-Ring Master Links you will need a chain press to properly install. I keep a spare master link on my quad too, which could be installed in the field were a chain to break, however without a chain press you would likely have to exclude a couple of the o-rings, but it should get you home no problem.
Overall these seem like very well manufactured, quality, master links.