Can someone tell me what this is?

[Curapa]

It was on my boat when I bought it. I use it to hang my chum bag from.

[tsubaki]

Gotta be a ladder boarding mount.
Much like this but different manufacturer.
http://www.garelick.com/product.php?pnumber=99180

http://www.garelick.com/images/products/99180.jpg

[Curapa]

Thanks,

I've been trying to figure that out for a while now.

Curt