Oval Carabiner: Oval carabiners have been around for decades and currently hold an important place in the market. The symmetrical oval shape allows the carabiner to be easily flipped or rotated without compromising its tightness of the carabiner. So the oval carabiner is very suitable for assisting climbing mountaineering because the oval carabiner will not interfere with other carabiners. However, oval carabiners are inherently weaker than other shapes, and D-shaped carabiners are a better choice when they are lighter in weight and strength.
D-shaped carabiner: Generally, the design is asymmetrical. The D-shaped carabiner can transfer more force from the opening to the carabiner. The force of this carabiner is more reasonable. The D-shaped carabiner of this design can be made lighter than other carabiners and has a broader opening. D-shaped carabiners are excellent for clip-in protection, quick pull-out, and locking anchor points. Because they are more versatile than standard symmetrical ovals, they can be more expensive.
Offset D-Shape: It is similar to a D-Shape carabiner in design and function. The only difference is the exaggerated asymmetrical design. This carabiner generally allows a wider buckle opening so that this carabiner will be larger than the standard carabiner. The d-shaped carabiner is a little more expensive.
HMS carabiner: This type of carabiner is also commonly known as a pear carabiner, an oversized version of the offset d-shape designed for protective use. Because this design works great when used with protectors or hooks for protection. HMS carabiners have the same weight and strength deficiencies as oval carabiners and are generally made from thicker bar stock. Many climbers prefer the HMS carabiner to attach to their belay.
