Professional tools: There are 20 different shapes and sizes of rotary cutters, which are very suitable for model making or engraving etc. According to your work needs, you can choose different types of cutting heads to meet your different process needs. Multi-function tools: The diamond drill bits have 10 different grinding heads, which are very suitable for engraving, cutting, polishing, chamfering, grooving, reaming , drilling, etc. Compatibility: 3mm (1/8") rotary tool holder is suitable for most electric rotary tools or grinders. < p>Quality material: The countersinks are made of high quality high speed steel with Long service life, have the advantages of high hardness, good wear resistance and heat resistance. Tool - Milling Cutter Tool - Wood Engraving Tool - HSS Wood Cutter with 1/8 inch (3 mm) rod , suitable for Dremel for craft projects and DIY creations & peeling & cutting tools etc. as shown. Excellent workmanship: Excellent workmanship quality and highly polished cutter