A double locking hook is a type of metal hook that is commonly used in a variety of industrial and commercial applications, such as construction, maintenance, and transportation. Double locking hooks are designed to provide a secure and reliable connection for ropes, cables, or other equipment, while also featuring a locking mechanism that helps to prevent accidental detachment.

Double locking hooks typically feature a spring-loaded gate that can be opened by pulling back on a small lever or pin. However, in addition to the gate, they also feature a secondary locking mechanism that helps to prevent the gate from accidentally opening. This secondary mechanism may take the form of a twist lock, a screw lock, or a triple-action lock.

The added security of a double locking hook makes it well-suited for use in situations where a secure attachment point is critical, such as when working at heights or when securing heavy equipment. Double locking hooks may also be used in rescue and emergency situations, where a quick and reliable attachment point is needed.

When selecting a double locking hook, it's important to consider factors such as the weight and load of the equipment being attached, as well as the specific needs of the user and the application. It's also important to inspect the hook regularly for signs of wear or damage, and to replace it immediately if it shows any signs of weakness.