It’s just a plastic – I’m sorry, resin (like plastic but more expensive to help pay off marketing majors’ student loans) – ‘biner with a wire gate and a little shelf on top. The shelf is the magic part, allowing you to flip screws up and keep them there while you find just the right one. Sounds minor; it’s not.
There’s even a little hole to tie in keeper cords for… I don’t know, your crack pipe? The clip stabilizes it on your harness; beware it’s a bit of a pain to get on and off. Non-load bearing.