I use these on my boat to hold the support chains on my swim grid. They are stainless, not polished (although very smooth) and load rated. Made in Germany and way cheaper from a climbing store than padeyes in a marine store.
For rock climbing.
Just because it wasn't stamped "marine" on it doesnt mean its not useful. That hook you show us locks and is intended to support a human. Might be very good as a crane hook. Or for clipping onto a mooring buoy.
"...Tongue tied and twisted, just an earthbound misfit..."