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Straight gate carabiners are also found in sports like backpacking or kayaking, where the carabiner is relied upon for simpler duties, like hooking into a dock line or attaching a sled or tool to your pack. The straight gate style of carabiner can be seen as a semi-happy medium between the heavy duty wire gate carabiner and the wire carabiners that frequent keychains and outdoor shows.
The Bent Gate Carabiner
Like a straight gate carabiner, bent gates are exactly what they sound like: carabiners with a gate that’s slightly curved. While not as frequently seen in the outdoors, these carabiners are primarily used by climbers, as the bent gate carabiners receive rope much more easily than the straight gates. The curve in the gate allows for extremely quick hook-ins, which can be vital as climbers make their way up the wall.
The Twin Gate Carabiner
A relatively recent invention, the bent gate carabiner is an interesting medium between locking carabiners and straight gaters with no lock. These carabiners have two gates that open on opposite ends, creating a sort of lock that requires special pressure to open. While not widely used, they are effective in situations that call for a bit of extra safety; some climbers or outdoor enthusiasts actually prefer them to traditional straight or bent gate carabiners.
Types of Locks:
Locking carabiners often come in three different varieties.
Screw lock: In screw lock carabiners, a metal cylinder must be screwed up to cover the nose once it’s in place or down to allow the carabiner to open.
Oval-shape carabiners are symmetrical with a semi-circle curve at the top and bottom. This is the twist lock carabiner shape; they’re inexpensive, and their wide curves mean they can hold a lot of gear and accommodate a variety of hitches. However, they can be a pain to clip while lead-climbing because it’s hard to tell at a glance if they’re upside-down or right-side up. Another con: oval carabiners tend to be heavy.