Routers are among the most versatile tools in any woodworking shop, but their performance depends entirely on the bits you use. With hundreds of profiles and sizes available, selecting the right router bits can be overwhelming for both beginners and seasoned professionals. This comprehensive buying guide will demystify the world of router bits, covering the essential types, the materials they are made from, and which ones deserve a place in your collection. Let’s start with the anatomy of a router bit. Every bit consists of a shank, a body, and the cutting edge. The shank is the part that fits into the router collet, and it comes in two sizes—1/4 inch and 1/2 inch. The 1/2-inch shank is vastly superior because it offers greater stability and reduces chatter, resulting in cleaner cuts. If you are buying a new router, we strongly recommend a 1/2-inch collet model, though many routers come with interchangeable collets for both sizes. The cutting material is the most critical factor in bit quality. High-Speed Steel (HSS) bits are common and affordable, but they dull quickly, especially when cutting abrasive materials like plywood. Carbide-tipped bits are the industry standard for serious woodworkers. The carbide tips are brazed onto the steel body and can be sharpened multiple times. For the best performance, look for solid carbide bits, which stay sharp significantly longer and produce a superior finish, though they cost more. The most frequently used bit is the straight bit. It is the workhorse of routing, used for grooving, dadoing, and mortising. Straight bits come in various diameters, with 1/4 inch, 1/2 inch, and 3/4 inch being the most common. If you cut a lot of plywood, consider buying a compression spiral bit, which cuts cleanly on both the top and bottom edges, eliminating tear-out. The flush trim bit is another essential tool. It features a bearing at the tip that rides against a template, allowing you to perfectly duplicate shapes. This bit is invaluable for pattern routing and flush-trimming edge banding. The bearing can be positioned at the top or bottom, and some bits feature interchangeable bearings to change the cutting depth. For decorative edges, the roundover bit is your best friend. It creates a smooth, rounded edge on tabletops and shelves. Roundover bits are available in radii from 1/16 inch to 1 inch. A 1/4-inch roundover is a versatile choice that works well on most furniture projects. The chamfer bit is similar but creates a beveled edge instead of a rounded one. It is perfect for adding a contemporary look to cabinets and picture frames. The rabbeting bit is designed to cut rabbets—a recess along the edge of a board. This bit includes a bearing that controls the depth of cut, and many sets include multiple bearings so you can change the rabbet width without switching bits. If you plan to build cabinets, a rabbeting bit is almost indispensable. The dovetail bit is a specialty tool used primarily for making dovetail joints. It comes in two angle standards—English dovetails at 14 degrees and French dovetails at 7 degrees. The steeper angle is more common in the United States and is stronger for drawer construction. To use a dovetail bit effectively, you will also need a jig or a precise setup. The Roman ogee bit produces an elegant S-shaped profile that is often seen on traditional furniture. It adds a classical touch to frames and door panels. While not an everyday tool, it is a wonderful addition for special projects. When building your router bit collection, start with a starter set of the most common profiles—straight, flush trim, roundover, and chamfer. Then, add specialized bits as your projects demand them. Avoid buying the cheapest sets, as they often use low-grade carbide and will burn wood or dull within a few passes. Instead, invest in reputable brands like Whiteside, Freud, or Amana Tool. These brands use micro-grain carbide that holds an edge considerably longer. Bit maintenance is crucial for longevity. Clean your bits regularly with a resin remover to prevent pitch buildup. A dirty bit creates friction, which generates heat and accelerates dulling. Additionally, store your bits in a padded case to protect the delicate cutting edges. A sharp bit is a safe bit, so replace or sharpen your bits as soon as you notice burning or rough cuts. In conclusion, router bits are an investment that pays off in the quality of your projects. By understanding the different types and materials, you can make informed decisions that improve your woodworking results.