Has a support wheel to allow the milling cutter to move along the edge for a good pass. Make sure there are no bumps on the edge, otherwise it will reveal the beveled one. The price was great and the delivery was perfect. I've used it to bevel the edges of my curved pressure treated pine exterior handrails that go down the steps so they are smooth and won't chip with age giving a nice look. A little bit of sanding and voila.