Most commonly, you will see rounding-over bits in 3/8 and ¼ inch sizes. These bits are available in a variety of sizes and are labeled by the cut’s radius. You can change the cutting depth when you adjust the base of the router. Rounding over sharp edges, this bit is equipped with a ball-bearing pilot which will direct a cut’s width. This is the correct bit when you want to shape an edge on a chair arm, tabletop, or shelf. With this bit, you can cut grooves, dadoes, and rabbets. Providing straight and square-bottomed grooves, you can purchase this bit in a range of diameters but is most common in a ¾, ½, and ¼ inch sizes.
Solid carbide tipped router bits and tungsten bits may also be available.
When you're shopping for individual router bits or router bit sets you'll mainly see two different types: carbide-tipped bits and hardened steel (HSS) bits. Router bits are designed to serve three primary functions: To create wood joints, to plunge into the center of a piece for grooves or inlays, and to shape the edges of wood.
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