PETZL Vertigo Twist-Lock Biner INTENDED USE: The VERTIGO TWIST-LOCK carabiner is designed to use on progression lanyards. SIZE AND STRENGTH: This carabiner's wide opening (25 mm gate) allows it to be easily connected. Its major axis strength is 25 kN. EASY TO USE: The ergonomic shape offers excellent grip while the wide opening facilitates easy manipulations when passing intermediate anchors. LOCKING SYSTEM: The TWIST-LOCK automatic locking system is unlocked by a simple rotation. NO MORE SNAGGING: Petzl's Keylock system helps avoid accidentally snagging your carabiner on your gear.