4 stainless steel H-shackle with special anti-theft head Constructed of very strong stainless steel Much easier to use than S-hooks, as well as reuseable These shackles take the place of S-hooks. These are used when a wide opening is needed. 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. Use with our swing hangers, Tire Swing and chain except the A7600 green, A7700 red and the A7800. The shorter bolt is 3/8” ID and the longer bolt is 1.25” ID. The smaller opening is ½” and the wider opening is 1 1/16”. This head makes removal because of vandalism more difficult. The shackle is 212 HBS and the bolt is 176 HBS. The hardness of the bolt in the A5725 is: long needle hardness HRC29 / short needle hardness HRC31. This product should last 2 years in harsh conditions and up to 5 years in optimal conditions. Some conditions may require replacement sooner. Tensile strength 1461 lbs.