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With so many different types, shapes and locking systems, choosing the right climbing carabiners can be a complex task. To help you make an informed decision, here's a guide to finding your faithful climbing companions.
Straight-finger carabiner: This one is designed for easy use when hooking onto progression points along your route.
Angled finger carabiner: This model is recommended for easy clipping of your rope.
D-shaped carabiner: Provides a good finger opening and optimum strength. This type of carabiner is often chosen for belay devices.
HMS carabiner (pear-shaped): "HMS" stands for "Half Middle Snap". This carabiner is wider at the top and slightly flattened, giving it a large opening that can accommodate capstan or half-capstan knots, or even two strands of rope.
Symmetrical carabiner: The oval shape of this model is almost perfect, with the finger parallel to the opposite side of the body. It's a strong carabiner that, unlike an HMS carabiner, can easily be turned around in the anchor point if necessary.
K-type carabiner: This model is specifically designed for via ferrata climbing. It can be fitted with a release system activated by the palm of the hand, while the index finger releases it from the anchor point, or it can feature a sliding ring. For your via ferrata safety, it's essential to use specific carabiners.
Screw system: This is the most common and versatile locking system. It's easy to operate, even with gloves, and can be fitted with a colored indicator to help you check that your carabiner is properly closed.
Safety ring system: This system uses a ring with one notch for opening and one for closing, although it has become less common.
Automatic locking system: Requires 2 or 3 movements to open the locking mechanism. Sometimes you even need to press a button to trigger opening. This model may be more difficult to handle, but it offers automatic ring closure and maximum safety, especially when used with children, who will not be able to open it by accident, even when playing with the carabiner.