The Carbide 3D McFly Cutter 1/4in. will make light work of any lumber thrown at it. The razor-sharp, indexable carbide tips are perfect for surfacing your wasteboard or finishing up that beautiful end grain cutting board you've been working on. Each bit comes with 4 indexable inserts. This tool is designed for wood only, it is not for use on metals. It is only recommended for Shapeoko machines, not Nomads. Recommended Speeds and Feeds: * Depth per pass: 0.02" * RPM: 16,000 * Feedrate: 60 in/min NOTE: This version of McFly has an 1/4" shank and is compatible with all Carbide routers and spindles. If you have an 80mm spindle with an ER16/ER20 collet, you might prefer the McFly with a 8mm shank.