These shackles take the place of S-hooks. Unlike S-hooks they can be used multiple times. They are also much easier to install then S-hooks. They are stronger and some cities and parks are requiring their use instead of S-hooks. This shackle is 2 1/8” long. The ID is 13/14” and the opening is ½”. This shackle works with our swing hangers and chain except for the C128 – C129 chains. Tensile strength is 8000 lbs.