PETZL - William, Locking Carabiner for Belaying INTENDED USE: The WILLIAM carabiner is the optimal shape for belay stations and belaying with a Munter hitch knot. SIZE AND STRENGTH: Its large dimensions (28 mm gate) allow it to hold an array of equipment. The WILLIAM'S major axis strength is 27 kN. EASY TO USE: The asymmetrical pear shape allows for easy opening and manipulation. It's also easy to grip with gloves on. LOCKING SYSTEMS: Choose between three locking systems: Screw-Lock for occasional use or dirty environments and Ball-Lock or Triact-Lock for automatic locking with triple-action gate opening. NO MORE SNAGGING: Petzl's Keylock system helps avoid accidentally snagging your carabiner on your gear.