Gedore 80mm Ratchet Ring Spanner

I picked up this Gedore 80mm Ratchet ring Spanner Attachment 239118 (http://www.woodworkforums.com/attachments/f65/239118-gedore-80mm-ratchet-ring-spanner-gedore80mmratchetringspanner.jpg)at a local market for cheap enough to be a wall hanger. I am wandering if someone might know what size bolt and nut would fit this toy? I am toying with the notion to turn the bolt and make the corresponding nut out of wood, just to display it.

Source: http://www.woodworkforums.com/f65/gedore-80mm-ratchet-ring-spanner-161288/

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