I know this has to have a very specific use, sadly I don't know what that is. It seems the multi layer "chuck" can be moved up or down the shaft by loosening a couple allen set screws, but those small teeth on one side are just strange. They are not cutting or scraping blades, too delicate, they seem designed to fit into a matching slot on some arcane piece of machinery. No makers name on the plastic handle, but it does say USA and perhaps the number 850 or 350 above that on the sliding chuck. Any ideas?