Professional tools: There are 20 types of rotary cutters in different shapes and sizes, which are very suitable for model making or engraving. You can choose different types of cutting heads according to your working needs, they will meet your different process requirements. Multi-functional tools: the diamond drill has 10 different grinding heads, which are very suitable suitable for engraving, cutting, polishing, chamfering, grooving, reaming, drilling, etc. High quality materials: the milling head is made of high quality high speed steel, with long service life, high hardness, wear resistance and good heat resistance. Package size: 8cm x 6cm x 0.5cm Shipping Quantity: 1 set, there are 20 pieces in total