Features 1、These burrs are made of cemented carbide for high hardness, high abrasion resistance 2、There are total 4 pieces burrs in various shapes or sizes that you can use for many purposes 3、6mm round shank would fit many electric powered or pneumatic powered tools 4、Could cut cast iron, cast steel, bearing steel, high carbon steel, chromium nickel alloy, bronze, brass, marble, jade, bone, etc 5、Widely used for carving, shaping and for the removal of sharp edges or corners, burrs and excess material Specification Features: These burrs are made of cemented carbide for high hardness, high abrasion resistance. There are total 4 pieces burrs in various shapes or sizes that you can use for many purposes. 6mm round shank would fit many electric powered or pneumatic powered tools. Could cut cast iron, cast steel, bearing steel, high carbon steel, chromium nickel alloy, bronze, brass, marble, jade, bone, etc. Widely used for carving, shaping and for the removal of sharp edges or corners, burrs and excess material. Specifications: Material: Cemented carbide Shank Diameter: 6mm Head Diameter: Large F--12mm; Small F--10mm; C--10mm; D--10mm Quantity: 4 Package Includes: 4 x Rotary Burrs Package List