It was pointed out to me by a Dane, that they call parrel beads bullseyes, because that is what they look like. And now you come to mention it
Solid bronze thimbles. Made to British Standard 464 (1958) design. Dimension refers to width of groove for wire or rope.
Very hard and light, these work very well with both polyester and Dyneema ropes. Click on 'Large view' for more dimensions.
Thought we would re-introduce these, both in their own right and as part of fairleads