You can never have too many locking karabiners in your arsenal and there's one designed for just about every occasion. From the Boa to the Belay Master, the Oval to the Revolver, and a choice of Screwgate, Quicklock (double-action) and Locksafe (triple-action).
Read more at http://www.ukclimbing.com/gear/news.php?id=6117