To increase security, some climbers use two carabiners in tandem with their gates reversed. It is less likely that something would cause both gates to open at once. An alternative to a pair of carabiners, the locking carabiner has an additional mechanism that makes it harder for the gate to open accidentally: a sheath that covers the gate and the outer C-shaped portion of the carabiner. This sheath either screws into place, or uses a spring to hold it in place. If you have any questions regarding a particular carabiner, please contact us.