Alternative term: Sinker bail (USA)
Lug made of iron or steel, embedded in a sinker, to which a mooring chain is shackled.
The term "anchor ring" is also loosely used in Great Britain with this meaning.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
United States of America
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM