Spherical rotary cutter: Head diameter: 40mm, handle length: 68mm, handle outer diameter: 25mm Durable: Grinding tip made of heat-treated tungsten carbide, which has a service life of 10 times longer than HSS, suitable for processing various types of metal materials, including hardened steel ≤ HRC65 Multipurpose: Grinding accessories widely used in carving, woodworking bowl cutting, model making, wood carving, bowl plane iron, casting, deburring, grinding and carving< /p> Function: Wood carving grinding wheels have a very rough coating to quickly remove the vacuum while maintaining a relatively smooth surface.