FresKaro UIAA Certified 25KN Auto Locking Climbing Carabiner Clips, Twist Lock, and Heavy Duty Carabiners for Rock Climbing, Rappelling, and Mountaineering, D Shaped 3.93 Inch, Large Size, Black

The FresKaro Carabiner is a sturdy product that is great for holding tools or for use in other applications where a non-locking biner may cause entanglement issues. The swivel locking mechanism prevents the carabiner from becoming unlocked with vibrations or normal use and automatically locks when closing. While it's not approved for fall protection, it is strong enough to hold up to 4850lbs during static situations. One reviewer notes that the inner area was too small for their rope, which may be something to consider depending on what rope you'll be using it with. Overall, this carabiner is a good quality product that's worth considering if you have a need for it.