Black Diamond Keylock Mini Pearabiner

I've been using this 'biner for more than a year, and it's just the right size to use on your harness. I clip into the rope with it, use it for my belay/rappel device and keep a couple handy on my harness or pack straps for clipping anchors. I really don't understand it when I see people toting these crew-served ginormous D's around when something smaller like this will do.