Our 3/16″ Trivalent chain is made to resist rust . This chain meets all ASTM requirements. The coating has a consistent bright finish. This chain would be good in coastal areas. The chain is 4/0 Aught and Grade 30. The links are 1” long and the opening is ½” wide. Any of our S-hooks or Shackles will work with this chain. Chain that is not bought from a playground manufacturer does not have the quality control and have been known to have weak links and can contain air bubbles. This product should last 2 years in harsh conditions and up to 5 years in optimal conditions. Some conditions may require replacement sooner. Tensile 3200 lbs..