These C links are 316 stainless. They are used quite a bit for different things in commercial fishing. I've never had them come undone on their own. The two slits have to be lined up just right to be unhooked and re hooked by hand. Even when laying slack they dont unhook themselves. Have been using them for years with zero problems. I had them spliced right into my rode in two spots and i painted those two spots on my rode a flourescent pinky red so that i can see when those spots are at my bow if i want to clip or unclip them. The links are the same size as the anchor chain links so they go around the windlass gypsey no problem.
Most of the time when im bottm fishing anchored in good weather and sea conditiins i dont even bother unclipping from my windlass but just in case i leave my top colored clip section right at my bow hatch so that if i do have to unclip its right there. And my scotcman, quick release attached to the other rope going to my back fish deck is sitting right there next to it for quick access if i ever want to unclip from my windlass.
View attachment 60288
View attachment 60289
View attachment 60290
View attachment 60291