1.25" Quick Release Sling Swivels: Push-button D-loop size is 1.25 inch, perfect fits for 1-1/4" wide two point traditional slings. High strength steel hoop ensure max durability under heavy using, will not be deformed or disconnected due to overweight. Unique Sling Mount Base: Unique customized style, lightweight and low profile design, attached securely to all m-rail slots. Steel locking T-nuts screws, not easy bent or broken when you tightened them.