Rotary Carbide Burr Set 1/8" Shank, 1/4" Head Length Tungsten Steel for Woodworking Drilling Metal Carving Engraving Polishing3*6mm Metal Drawing Tungsten Carbide Milling Cutter Rotary Tool Burr CNC Engraving Abrasive Tools Metalworking Milling Polishing Double cut burr (Cross Strips) have more cutting edges and could remove material much faster. It is more suitable for relatively low density materials such as wood, plastic, aluminum, soft steel and all non metal materials. Single cut (Paralleled Strips ) burr provides large, wide flutes evacuate the large chips easily and