Black Diamond VaporLock carabiner

What I do know is that it is a keylock design, and while they recommend sticking to 9.4mm ropes or smaller for Munter hitching I tried it on a 10mm and it seemed to work just fine. There are a lot of applications where you don't need a monster crew-served 'biner, especially if you're not doing rescue work, and despite the hype the Vaporlock is ultralight and nicely sized for general climbing use.