The Most Advanced General-Use XL Carabiner on the Market. Rescuers working in the most demanding circumstances will appreciate our ProSeries XL Aluminum Ladder Hook Carabiners, the first aluminum carabiners to meet NFPA strength requirements for General Use. Combining high performance with minimum weight, these XL-sized specialty carabiners significantly reduce the weight of a rescuer's gear while maintaining the highest possible margin of safety. The patent pending key-lock design eliminates snagging when removing the carabiner from your harness or ladder belt, and the XL size provides a full 2.1-in. (53-mm) gate opening for secure fast-action connections to ladders or anchors. Gate choices include the traditional Screw-Lock, or the easy-to-open-with-one-hand Auto-Lock. Both of the XL carabiner models have a removable stainless-steel keeper pin. Every carabiner is proof loaded.