I once read an interesting commercial for Freud's "Quadra" cutter that explained how half the blades cut "up" and the other half cut "down" for smoothness to enhance. No matter how you do it, it works. If you want to finish the entire radius on a "2-by" workpiece, this is your product. One pass on each side (this is a deep cut - not too fast) and you're done. A smooth, polished cut that didn't require further sanding for my application. This is an expensive device. It's worth it.