Anyone tell me what this is for?

It is the bit that goes round the boom to allow a kicking strap to be used when the sail is reefed on a yacht that has round the boom reefing.
 
In that case stick it on Ebay. Lots of older boats have lost this fairly crucial component. Probably worth £50+ to someone.

+1 and that one is fairly meaty... when I was looking for one for mine I was only looking for one like this and it cost me £20....

Claw_ring.jpg
 
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