I really like S-biners! I hook these to various locations on my laptop backpack to hold things like my keys and a small TSA approved Leatherman. I also use various sizes of S-biners when camping to organize camping stuff and to connect ridgelines for lightweight tarps.
I'm hoping a 5 means the best! It's a wonderful clip. Couldn't find this size around here, but love it.
My wife is a weaver for each project, she has to change her pedaling on the loom. She found your S-Biners at our local hardware store, but they were too large. She asked me to order #1's and they worked perfectly.
Absolutely wonderful product. 0 complaints, works as expected. They're definitely better than a regular carabiner with how easily you can clip in/out of them. I use these to easily hook in water bottles. Don't need a pocket for my Nalgene anymore!
Wonderful product, does absolutely everything you'd expect it to and nothing you don't. So far it's held onto everything I've thrown on it from rock climbing shoes to a Canon 70D all the way through the Grand Canyon. Easy as cake to use, definitely worth buying (sooooo much better than a normal carabiner).