General description Made of high-quality high-speed steel, the AlwaysH 20 Pack Dremel Tungsten Carbide Cutter Burs Rotary Grinder Drill Bits are designed for long life and exceptionally precise cuts. This set is a valuable addition to any carpenter's rotary tool, suitable for various rotary tools including DREMEL, Craftsman, and Chicago. The 20 pieces include the most commonly used types of cutters, making it ideal for all types of detail work. Technical specifications Material: High Speed Steel (HSS) Stem diameter: 3.17 mm Includes: 10 Carbide Engraving Bits and 10 Wood Router Bits Usage Suitable for detailed work such as building and sanding dollhouse furniture, model trains, or model buildings and planes. Capable of engraving on a wide range of materials including wood, ABS, acrylic, PVC, and plastic. User-friendly design with an easy insertion process for longer life and ease of use.