The Camp USA HMS 3Lock Carabiner is an automatic locking carabiner for the belay or rappel. Safety is pretty important while climbing, so why not add a 3-action carabiner to your equipment? This fits in and is usable with just one hand, but requires a slide, twist and pull to open up. The more action required, the safer it is, since you know this won't be popping open on its own. At the very least it'll give those fingers and thumb of yours something to do. Every so often.
So sorry, but only 4 items are allowed for comparison, so we're comparing the first 4. I blame the gnomes and so should you.
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