Specification Brand : uxcell BulletPoint1 : Specifications: Shank diameter: 3mm(1/8"), cutting edge diameter: 3mm(1/8"). Fits most rotary die grinders BulletPoint2 : Long Working Life: Made of heat-treated tungsten carbide that hardness can be up to above HRA85, sharp and sturdy, long service life BulletPoint3 : Single Cut Design: Single groove rotary files are more suitable for the object density is relatively high, such as alloy steel, stainless steel, hardened steel BulletPoint4 : Versatile Use: Widely used for metalwork, tool making, model engineering, wood carving, jewelry making,welding, chamfering, casting, deburring, grinding, sculpting BulletPoint5 : Tips: Requirement of the carbide burrs rotating speed is: 4000-50000 rpm. Always ensure your burrs shank is well inserted into your collet and clamped down tightly ItemName : uxcell Tungsten Carbide Rotary Files 1/8" Shank, Single Cut Cylindrical Radius End Rotary Burrs Tool 3mm Dia, for Die Grinder Drill Bit Alloy Steel Hard Metal Carving Polishing, 12pcs ItemPackageDimensions_Height : 0.39 inches ItemPackageDimensions_Length : 5.51 inches ItemPackageDimensions_Width : 3.94 inches ItemPackageQuantity : 12 ItemTypeKeyword : cutting-burrs Manufacturer : uxcell Material : Tungsten Carbide MeasurementSystem1 : Imperial MeasurementSystem2 : Metric PartNumber : a24022700ux0120 ProductDescription : Description: Cleaning trimming, veining and weld joint of casting, forging and weldment. They are suitable for polishing metals and plastics. Can be used with most hand power tools. Highly recommended for jewelers, lapidary use, hobbies, crafts, craft modeling, home repair and so much more. Great for filing glass, ceramics, tile, brick, plastics, wood, fiberglass, stone, rock carbide, gold, silver, metals, and anything with a hard surface.