Description Compatibility: All shanks are 3mm in diameter, which can be compatible with most mold grinders and rotary tools when doing finishing, grinding and shaping work; just install it like other typical drills, which brings you more convenience. Engraving drill set: you will receive 10 pieces / 2 sets of wood carving and engraving drill accessories, which are enough for you to use and help you do various handicrafts without destroying wood, and get beautiful and smooth finished craft effects Material: Made of high speed steel, durable, strong and durable, not easy to break, providing good cutting power and durability; these cutters are designed to remove wood faster and you can easily handle the wood while maintaining a smoother surface. Size Information: The size of our engraving drill bit is about 33mm, 34mm, 36mm, 37mm, 38mm shaft and drill diameter, different sizes can meet your different needs Application: Mainly used for carving and carving drill bits, also suitable for beginners or skilled people, manual DIY carving production, you can also share with friends or family