Our 3/16" Swing Chain has a smooth zinc finish and is Pre-Cut to 3 1/2' length. 3 1/2' lengths are recommended for Swing Rings, Swing Triangles and Trapeze Bars. 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 purchased from a playground manufacturer do not have the quality control and have been known to have weak links.. 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.