Product: Set of 20 rotary files carbide bar/carbide cutters Shank diameter: 0.1 inches (3 mm) Total length: 1.6 inches (40 mm) Package included: 20 rotating files set high working efficiency, good grinding effect. Use with rotary tools such as a router drill. Single groove application: chip fast, high hardness, suitable wood, aluminum, plastic root engraving and carving. Tungsten carbide bars are widely used in a variety of fields due to its durability, hardness and high temperature resistance properties. Tungsten carbide bars are widely used in metal processing industry, such as metal cutting, drilling, milling and lathing. Especially suitable for metal and alloy processing with high hardness Used in manufacturing automotive parts for engine parts, gears, brake discs, etc. It plays an important role in the manufacturing of automotive parts where precision cutting is required.