Features 1、Dimensions: Total length 49‑63mm/1.93‑2.48in, shank diameter 6mm/0.24in, outer diameter of the tip 8mm /0.32in, tip blade length 7.2‑20mm/0.28‑0.79in. 2、Durable Construction: Using high‑quality heat‑treated tungsten carbide, the hardness can reach HRC70, durable to use, very suitable for fine detail work. 3、Multipurpose Tool: These cutting burr set is widely used in metal products, woodworking, model engineering, wood carving, jewelry making, welding, chamfering, casting, deburring, grinding, etc. 4、Easy to Use: Generally can be used with hand‑held electric or pneumatic tools (also for machine tools, the speed of electric/pneumatic tools is usually around 6000‑50000 rpm. 5、Long Service Life: Ten times higher than the durability of high‑speed steel cutters, and more than 200 times higher than the durability of small grinding wheels. Specification Item Type: Die Grinder Bit Material: Tungsten carbide Granularity: 1000 (mesh) Outer Diameter: Approx. 8mm/0.32in Shank Diameter: Approx. 6mm/0.24in Purpose: Polishing and grinding Application: Tungsten steel grinding head has a wide range of uses, and is used in machinery, aviation, automobile, shipbuilding, chemical industry, craft carving and other industrial sectors Package List 5 x Grinder Bit 5 x Storage Box