1. of finish, can work out the high accuracy of shapes mold cavity. 10 times higher than the durability of high speed steel cutter, 200 times more than the small wheel durability. 2. High strength and hardness. Easy and safe to use. Reduce labor intensity. Durable in use. 3. Use with handheld electric or pneumatic tool drive (can also be used in machine tool). The speed of the electric or pneumatic tools usually is 6000-50000 revolutions per minute. 4. Processing all kinds of metal (including all sorts of hardened steel) and non-metal (such as marble, jade bone), machining hardness reach less than HRC70. 5. For the most work it can be replaced with small grinding wheel, and no dust pollution. Used to clean trimming, veining and weld joint of casting, forging and weldment; finish all kinds of metal ; impeller passage of finishing processing; of mechanical parts chamfer, round and groove processing; inner hole surface of machinery parts finishing; the process of metal and nonmetal sculpture. Brand new diameter: . 8mm diameter: . 6mm length: . 40mm Total length: 50-60 mm colour:Silver Material:Tungsten steel Package Contents: 5 x Tungsten Carbide Rotary Point Burrs Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.