Professional tools: There are 20 different shapes and sizes of rotary cutters, which are very suitable for model making or engraving, etc. You can choose different types of cutter heads according to your working 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, boring, drilling, etc. . Compatibility: The 3mm (1/8") rotary tool post is suitable for most electric rotary tools or grinders, such as Dremel, GOXAWEE, Proxxon, Einhell and similar machines. . Quality Material: The countersink bits is made of quality high speed steel with long life, has the advantages of high hardness, good wear resistance and heat resistance. . Perfect after-sales service: We are completely confident in the quality of the products, if you have any questions, please feel free to contact us, we will get back to you within 24 hours and give you a satisfactory solution. . .