I just cut the top and bottom 1/2 inch radius on 17 red oak stair turns from finished flooring. It will be 34 by 38 inches each, with a layer of cured coating removed on each side. The last step of the ladder was laid just as quickly and smoothly as the first. After that, they needed very little polishing, so I'm very happy that this bit will be relevant for a long time to come.