1.[Tungsten Grinder Bits]: These carbide Cutting burr, with 1/4 inch is made from Tungsten Carbide. Length:70mm, Cutting Diameter 1/2 inch, Length 45mm, Diameter 1/4 inch.For Bits Tool Accessories For , Fordom, , .2.[DOUBLE CUT DESIGN]: The groove lines of these carbide burr's head are crossed, which makes it more suitable for materials with relatively low density, such as wooden, plastic and aluminum.3.[Durable]: Hardness can reach to Less than HRC70, lasts long working life, sharp and durable.4. [LONG WORKING LIFE]: The working life of these solid burr is 10 than high-speed steel and 200 than grinding wheel.5.[Usage]Carbide drill file is widely used in metal products, tool manufacturing, engineering, model construction.Cutter diameter:0.47 inch/12mmLength of cut:1 inch/25mmEdge:DoubleShape of Cutter: CylindricalWarm Tips: your burr is inserted into your collet and clamped down tightly. wear an eye mask to protect your eyes from filings. confirm the size you need to buy purchasing.size: length 70mmMaterial:Cemented carbidecolour:silverPackage Contents:1 * Cylinder Shape Burrs Tool