'RINA' Calibrated Anchor Chain with 'Classification Society Certification' Suitable for Windlass
RINA is the Italian Classification Society and as such it is similar to Lloyds Register in the UK - Bureau Veritas in France - ABS in the USA.
Classification societies set technical rules based on experience and research, they confirm that designs, calculations and manufacturing procedures meet these rules. They ensure by test and inspection that the product meets their specification.
If your chain has 'Rina' Certification it is the best available.