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Designed for Die Grinder, Dremmel Tool or Rotary Drill which can go along with 1/8" shank carbide burs. * Sharp and sturdy, processing all kinds of metal and non-metal. The machining hardness can reach to HRC70. * Suitable for deburring and polishing cast iron, cast steel, carbon steel, alloy steel, stainless steel and other materials. * Assorted shapes include: ball, cone, rounded cylinder, flat top cylinder. * Cutting burs are larger than normal ones which makes it easier to do the wood job of carving. * Rapid chip removal, high precision machining materials, such as wood carving, glass fiber, plastic, aluminum, etc. * For jewelers, lapidary use, hobbies, crafts, craft modeling, home repair, diyer. * Package includes: 20 Tungsten steel Solid Burrs in a storage box. * Compatibility: smaller rotary tools such as those made by Dremel.