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A number of prominent climbing organizations (e.g. International Federation of Sport Climbing) either recommend or require two locking carabiners for clip-in attachment to a harness, e.g. IFSC Ru...
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A number of prominent climbing organizations (e.g. International Federation of Sport Climbing) either recommend or require two locking carabiners for clip-in attachment to a harness, e.g. IFSC Ru...