DMM HMS Phantom Screwgate Personal Locking Carabiner for versatility and low weight Personal lockers are used where weight and size are as important as strength, such as on sling runners and for most connection points on belay stances. In a standard 2 person climbing team, most of your locking carabiners will be personal lockers. Offset D carabiner for optimal loading and ergonomics D-Shaped carabiners encourage loading in their strongest orientation by forcing loads toward the carabiner spine. An Offset D refines this basic design by extending the top bar, increasing internal volume. This improves handling and compatibility with thick ropes and slings. Keylock nose eliminates snagging This carabiner's nose slots into a groove in the gate, allowing it to achieve full strength without a gate notch. This creates a clean internal profile that won't catch on gear, bolts or slings, giving easier clipping and removal from systems. I-Beam construction for optimum strength to weight ratio I-Beam construction techniques allow carabiners to be lighter without compromising strength. This is achieved through hot forging, a process which allows metal to be made into complex shapes that improve functionality.