Features: 1.Dimensions: Total length 52?63mm/2.05?2.48in, shank diameter 6mm/0.24in, outer diameter of the tip 10mm /0.39in, tip blade length 9?20mm/0.35?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_x000D_ Material: Tungsten carbide _x000D_ Granularity: 1000 (mesh)_x000D_ Outer Diameter: Approx. 10mm/0.39in_x000D_ Shank Diameter: Approx. 6mm/0.24in_x000D_ Purpose: Polishing and grinding_x000D_ 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