A friend of mine has loaned me his dremel tool. I am going to use it to route some pink foam board. The tool is in the case with several small attachments, all of which are loose. Most of them are drum shaped sanding wheels. There is one that is somewhat pear shaped and has small hard bristles on it for lack of a better description. I'm looking to know what I should be using as a router bit? Are there special bits that come with the tool? Can someone show a pic or give a description of what I should be using?