Per Jim Conlin:
I think that's called a 'scissor hook'
I would not consider it reliable.

Howcome?

Seems like with snap shackles the bail can get squinched over and
the whole thing can turn into just a hook.

The attraction of this thing for me is that once it's attached to
a steel ring and put under load, the scissoring of the
overlapping hooks seems to guarantee that it won't work loose.

All theory of course....
--
PeteCresswell