Shinto Saw Rasps are manufactured from high quality saw blades with coarse teeth on one side (11 per inch) and fine teeth on the other (25 per inch). Because of the saw tooth design, clogging is eliminated. Use the coarse side for shaping and rapid, chainsaw-like removal of material, and the fine side for finish cuts. We use them in our shop for shaping rubrails, stem and stern profiles, and rapidly removing epoxy slag. They are also perfect for rough-shaping MiniCel foam seats.