1.[CARBIDE DIE GRINDER BITS]: These carbide rotary burr set, with 1/4 inch shank is made from Tungsten Carbide. Total Length:55mm, Cutting Diameter 1/2 inch, Shank Length 45mm, Shank Diameter 1/4 inch .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]: Machined from new raw tungsten carbide, 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.Carbide burrs can process a variety of high-precision mold cavity,long service life,applies in the cast iron,cast steel,carbon steel,alloy steel,stainless steel,copper,and other metals.Wide range of uses includes body shops,fabrication shops,aviation industry,brake shops,industrial shops,die manufacturers, metalwork,tool making,model engineering.Machined from new raw tungsten carbide,unique tooth angle prevents chipping for the longest lasting design possible.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.Edge:DoubleShape of Cutter: Ball headColour:silverMaterial:Cemented carbideSize:Total length 55mmShank diameter:1/4 inch 6 mmCutter diameter:0.47 inch 12mmLength of cut:10.8mmTotal length: 55mmPackage Contents:1 x Carbide Burrs ToolOnly the above package content, other products are not included.Note: Light shooting 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.