Our 3/16" Swing Chain has a hot dipped galvanized finish. The links are 1 long and the opening is ½ wide. Any of our S-hooks or Shackles can be used with this chain. Chains for Swing sets that are not bought from a playground manufacturer do not have the quality control and have been known to have weak links and can contain air bubbles. Playground Swing Chains should last 2 years in harsh conditions and up to 5 years in optimal conditions. Some conditions may require replacement sooner. Tensile strength 3900 lbs.