High-strength steel locking carabiner. Very high quality steel for difficult conditions. For use with heavy loads. Large size allows easier connection of multiple elements. The texture of the locking sleeve facilitates locking and unlocking the carabiner. Wide opening for connection to thick anchors. Keylock system helps prevent snagging of the carabiner during maneuvers. Red indicator provides a visual warning when the carabiner is unlocked (on SCREW-LOCK version).