LEIGAO Tungsten Carbide Rotary Burrs for high hardness and high abrasion resistance. Machining hardness reaches HRC70. Cutting Edge Diameter: 8-10mm. Shank Diameter: 6mm (approx. 1/4 inch). Overall Length: 150-160mm (approx. 6.0-6.3 inches). Designed for use with handheld electric or pneumatic tools (can also be used with machine tools). Compatible with tool speeds ranging from 6000 to 50000 RPM. Double cut head design suitable for detailed work on cast iron, cast steel, carbon steel, alloy steel, stainless steel, marble, jade, glass, wood, and plaster. Ideal for metalworking, tool making, model engineering, wood carving, jewelry making, surface processing, welding, chamfering, casting, deburring, and grinding. Specifications: Color: As shown Material: Solid tungsten carbide Cutting Head Type: Double Cut Shank Diameter: 6mm (approx. 1/4 inch) Overall Length: 150-160mm (approx. 6.0-6.3 inches) Cutting Edge Diameter: Large F—10mm; Small F—8mm; C—8mm; D—8mm Package Includes: 4 x Tungsten Carbide Rotary Burrs