The Steel Carabiners AL is for Autolocking or selflocking carabiners that have a spring-loaded barrel that closes over the gate when released. This type of locking carabiner offers a little more security in the system over screwgate carabiners, but all carabiners should be second checked.
The Steel Carabiners SL is for Screwgate carabiners that have a barrel that moves vertically on a threaded gate. When closed the barrel creates a secure connection between the carabiner and top of the gate, locking the carabiner closed. Screwgate carabiners can come open and should be second checked before loading.
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