General description Carbide Spherical Rotary Burr is designed for woodworking and metalworking applications. With a head diameter of 40mm, this durable grinder bit is made from heat-treated tungsten carbide, ensuring longevity and efficiency in various tasks. Technical specifications Head Diameter: 40mm Handle Length: 68mm Handle Outer Diameter: 25mm Material: Heat-treated tungsten carbide Durability: Lasts 10 times longer than HSS Suitable for machining various types of metal materials, including hardened steel ≤ HRC65 Usage Carving Bowl cutting Model engineering Wood carving Bowl gouging Casting Deburring Grinding Sculpting