Sommerfeld’s Chip-Free Rail-and-Stile bit sets have two small radius cutters on the stile bit of this two-piece set that follow the primary profile cutters, slightly rounding over the top and bottom edge along the panel groove. This innovative feature virtually eliminates tear-out along the profile edges, helping you create cleaner, more attractive cabinet doors. We’ve battled this problem for years with a number of different rail-and-stile cutters with no good solution to fix the tear-out; these bits just do away with the problem up front. Nice!