This offer includes 2 (two) 3/16 Inch Amsteel Blue Dyneema Soft Shackles. These shackles have an inside diameter between 3-3.5 inches. 3/16 amsteel has a 4900 lb. breaking strength. I use a diamond knot on the head. If you want a quick release string let me know and I can add them before shipping. Not recommended for supporting people or equipment where life or serious injury could be in danger.