1.[Tungsten Grinder Bits]: These carbide Cutting burr, with 1/4 inch shank is made from Tungsten Carbide. Total Length:70mm, Cutting Diameter 1/2 inch, Shank Length 45mm, Shank Diameter 1/4 inch.For Rotary Bits Tool Accessories For , Fordom, , . 2.[DOUBLE CUT DESIGN]: The groove lines of these carbide rotary 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 rotary burr is 10 times longer than high-speed steel and 200 times longer than grinding wheel. 5.[Usage]Carbide rotary drill file is widely used in metal products, tool manufacturing, engineering, model construction. Cutter diameter:0.47 inch/12mm Length of cut:1 inch/25mm Edge:Double Shape of Cutter: Cylindrical Warm Tips: Ensure your burr shank is well inserted into your collet and clamped down tightly. Please wear an eye mask to protect your eyes from filings. Please confirm the size you need to buy before purchasing. size:Total length 70mm Material:Cemented carbide colour:silver Package Contents: 1 * Cylinder Shape Rotary Burrs Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.