This is one of the most popular takes on a self-closing hook, selling very well into construction and general industry markets. Made from Grade 100 alloy steel, 100% proof-tested. The eye design is versatile, as it can be used with chain slings, wire rope slings and even synthetic slings. The hook closes automatically once a load is applied, and the trigger assembly is easy to manipulate with one's thumb. Fatigue rated with a durable gray finish.