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You have enough to worry about while belaying already so use the Mad Rock Gemini Locking Carabiner as an extra defense against crossloading while giving a catch. With this B-shaped, double-basket carabiner, you can slide your belay device in the top while the bottom biner attaches to your belay loop so you can keep your belay device oriented correctly whether you're giving your buddy a catch on a single-pitch sport climb or you're patiently belaying while your friend works out the pro on a multipitch. Lock the top gate and it will lock the bottom at the simultaneously so you don't have to remember to screw two gates shut every time you gear up to belay.