Professional Set: There are 20 different shapes and sizes of rotary cutters. You can choose different types of cutter heads according to your work needs to meet your different craft design needs. MULTIFUNCTION TOOL: The diamond drill bit has 20 different grinding bits for engraving, engraving, chamfering, grooving, reaming, punching and more. It is an excellent tool for detailed work. High Quality Material: The countersink drill bit is made of high quality high speed steel, which has a long service life and has the advantages of high hardness, wear resistance and heat resistance. Compatibility: Suitable for Dremel electric rotary tools and most mini grinders. User-friendly design and simple insertion process, very easy to use. Multi-purpose: Dremel wood router bit can work on soft metals such as plastic, ceilings, drywall, laminate, fiberglass, vinyl, aluminum, etc. It is ideal for DIY enthusiasts, jewelers, designers and more.