Description: Carbide rotary burrs are used with high-speed electric grinders or pneumatic tools, which are widely used in industrial sectors such as machinery, automobiles, ships, chemicals, and crafts. Carbide rotary burrs can be used to process machine cast iron, cast steel, carbon steel, alloy steel, stainless steel, hardened steel, copper and aluminum. Feature: Great efficiency, high degree of finish, long service life and high accuracy. Easy to use, safe, reliable, economical and labor-saving. Work with high-speed electric grinders or pneumatic tools. Can process all kinds of metal(such as iron, steel, copper, aluminum) and non-metal (such as marble, jade, bone). Widely used in machinery, automobile, ships, chemical, craft and more. Specifications: Material: YG8 Tungsten Steel Head Shape: spherical, cylinder, torch, cylindrical ball Shank Diameter: 1/4in Overall Length: Shown as picture Grinding Head Size: Shown as picture Weight: Approx. 297g Package Includes: 2 x Spherical Rotary Burr 2 x Cylinder Rotary Burr 2 x Torch Rotary Burr 2 x Cylindrical Ball Rotary Burr Note: Please allow 1-3mm error due to the manual measurement. Thanks for your understanding.