✔【Widely Use】: Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing high-precision mold cavities. Processing all kinds of metal(including steel, aluminum, etc.) and non-metal (such as marble, jade, bone), and the machining hardness can reach to HRC70 | ✔【Premium Material】: This carbide burr set/rotary bit set is made of premium tungsten Carbide steel which has long working life, it has extremely high hardness and good toughness, machining hardness reach to HRC70. The carbide burr set cut through extraneous material like a hot knife through butter | ✔【Double-Cut Design, Efficient Work】: Double grooves grinding head adopts the cross-line design, which has the characteristics of fast chip removal. And faster cutting time and better polishing effect, significantly improve work efficiency, the processing efficiency is tens of times higher than the manual file tool, and nearly ten times higher than the small grinding wheel with the handle. The differing profiles let wood carvers or metal engravers trim any shape with ease | ✔【Adaptability】: Universal size 1/8'' shank diameter fits dremel and most small rotary tools with three jaw chuck for accurate centering. An ideal choice for your DIY woodworking, carving, engraving, and polishing. Shank diameter: 3 mm(1/8 inch), Cutting edge diameter: 6 mm(1/4 inch) | ✔【Satisfaction Service】: Carbide rotary burr set are gift for your artist friends and they were exactly what he wanted. If have any issues with this products, please feel free to contact us and we will give you a satisfactory answer