Professional Tools: There are 20 different shapes and sizes of rotary burrs, which are very suitable for model making or engraving, etc. You can choose different types of cutter heads according to your work needs, and they will meet your different process requirements. Multi-function Tools: The diamond drill bits have 10 different grinding heads, very suitable for engraving, cutting, polishing, chamfering, grooving, reaming, drilling, etc. Compatibility: The 3mm (1/8 ) rotary tool post is suitable for most electric rotary tools or grinders. Quality Material: The milling bits are made of quality high speed steel with long service life, has the advantages of high hardness, good wear resistance and heat resistance. Tool - Router Tool - Wood Engraving Tool - HSS Woodworking Burrs with 1/8 (3mm) Shank Fit for Dremel for Craft Projects and DIY Creations Multi-Shape Rotary Files: Rotary Burrs, Grinding Head, Carving & Peeling Bits & Cutting Tools etc as picture shown. Excellent Workmanship: Wonderful processing quality and highly polished burr can process a variety of mold into high precision shape. Universal Compatibility: 3mm (1/8) Shank Woodworking Burrs are suitable for Dremel rotary tools and most other brands mini grinders & mini drills. Great Gift for DIY Lovers: High working efficiency, good processing quality, reduce labor intensity, non-blocking and convenient to engrave, simple to use, safe and reliable. Specifications: Material: HSS (High Speed Steel) Shank Diameter: Approx. 3mm Cutting Diameter: Approx. 6mm Total Length: Approx. 40mm Net Weight: 58g Contents: 20 Rotary Burr