Normally Single Cruciform Bollard(Sometimes namely Single cross bitts) is only used for small ships with wire ropes, because mooring rope on big vessels is too big to be hold. The wire ropes diameter is from 12mm to 34mm. JIS-F2804 is one standard used for ship building issued by Japanese Standard Association. Now F2804-1976 has replaced the old F2804-1973 as the latest standard.Ekaship Hardware Limited have the details of most bollards. We are pleased to help you for free if you have any questions about any bollard or ship hardware.