The Camp USA Shell Belay Kit includes a locking carabiner and belay device designed deceitfully simple so any climber can use it. Camp constructed the Shell Belay Device with thicker walls than standard tubular devices for longer lasting durability. The HMS Compact Lock Carabiner has a rounder top to accommodate climbing ropes better, and its standard screw lock gate has a keylock nose to eliminate snagging on ropes when you're going off belay.