These are very old, heavy solid brass, and just as we found them. These are not mounted with a post, but have two protruding grounding nubs on the back that will have to be embedded into the wood in order for the back plate to be level (4-inch centers). The back plate is then screwed on from the front. These would be perfect for a trunk or chest. The pieces measures 6 inches across. No cleaning done on this pair.