Specification: Item Type: Cutting Burr Set Material: Tungsten Carbide Granularity: 1000 Mesh Outer Diameter: Approx. 8mm / 0.31in Shank Diameter: Approx. 6mm / 1/4in Application: Used in polishing and grinding, machinery, aviation, automobile, shipbuilding, chemical industry, craft carving and other industrial sectors. Package List: 5 x Cutting Burr5 x Storage Box