1. Material: This tungsten carbide woodworking router bit/chisel set is made of high quality tungsten carbide steel, which has a long service life.Shank Diameter: 3mm(1/8inch), Cutting Edge Diameter: 6mm(1/4inch), Please check the size before purchasing.Used on wood, iron, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals.In addition, marble, jade, bone, etc. 2. Multi-use: 1/8 shank cutters are compatible with most rotary tools.This rotary burr kit contains everything you need to drill, engrave, sand, polish and remove sharp edges.It is suitable for woodworking, stone carving, metalworking and blunt grinders.3. High Efficiency: Excellent for fine detail work, cutting, engraving, sculpting, touch-ups and finishing.Smooth surface after carving or engraving, so it can even process a wide variety of high-precision mold cavities.4. These carbide cutters are usually used with electric or pneumatic hand tool drive (can also be used in machine tools).The speed of electric or pneumatic tools is generally 6000-50000 revolutions per minute.5. Multi-Purpose Carbide Burr Set: This kit contains everything you need for drilling, engraving, grinding, polishing and removing sharp edges.It is suitable for woodworking, stone carving, metalworking and tool grinding.The kit includes a wide range of molds for all types of cuts.