Practical engraving drill bits: the package comes with 5 pieces of woodworking drilling and engraving accessories, and 10 pieces of HSS carbide rotary burrs, enough for you to use and help you make kinds of crafts without breaking the wood, to bring you smooth effect Material: made of high speed steel, and sturdy to use, not easy to break, provides nice cutting power to use; 15 Different shapes of bits are intended for more wood removal, you can easily work on wood faster while leaving a smoother finish; Suitable for grinding, polishing, shaping and burnishing softwood, plastic and rubber surfaces Various sizes for you to choose: carving drill bit measures approx. 3 x 3 mm, 3 x 4 mm, 3 x 5 mm, 3 x 6 mm, 3 x 8 mm shank and bit diameter, the router bit is about 1.5 inch/ 39 mm long and the handle diameter is about 3 mm; Please allow a little error on the size due to manual measurement Convenient to use: all shank sizes are 3 mm, which allows them to be compatible with most die grinders