Premium Material: Made of high quality tungsten steel. Suitable for machining wood, steel, iron, stainless steel, alloy steel, carbon steel, copper, steel etc. aluminum & other metals and jade, marble, bone etc. Wide Application: All drill bits with 1/8 (3mm) shank, suitable for most rotary tools and grinders. For example: fit for Dremel Tool, fit for Proxxon Tool, fit for Mister Tool and many others. Ideal for DIY, craft, hobby, home repair, jewelry, stone cutting, modeling and much more. Set of 10 rotary burrs includes: ball, nose, cone, cylinder, needle point, pointed, oval and tapered shank etc. Meet most of your drilling needs, suitable for woodworking, carving, engraving and polishing, chamfering, grooving, reaming, hollowing, beveling. < /p> Long Lifespan: Our double cut carbide cutting bits are easy to use, safe and reliable. The durability is 10 times that of high speed steel tools and more than 200 times that of small grinding wheels. Portable Packaging: 10pcs metal burrs