The Bag Swivel with snap hooks is used for attaching a boxing bag to a ceiling hook.
Top quality product. I have used it to connect a 3ft punching bag to a 4-screw ring-plate (which is attached to a wooden beam). The swivel assists in taking some of the weight and force when the bag is hit or kicked. It is a very solid piece of equipment and it is well worth the price. Very happy with it.