characteristic: It can process all kinds of metals (including hardened steel) and nonmetals (such as marble, jade and bone), and the processing hardness can reach HRC70. It can replace the small grinding wheel with handle in most work, and there is no dust pollution. The product has good processing quality and high smoothness, and can process high-precision mold cavities of shapes. The use is simple, convenient and reliable, which can reduce the labor intensity and improve the working environment. Tungsten steel grinding head is widely used in machinery, aviation, automobile, ship, chemical industry, craft carving and other industrial departments, and the effect is remarkable. describe Name: carbide rotary file Material: metal color: Silver Size: 6 x 6 x 150MM Specification: double grain Quantity: 10pcs Package Contents: 10 x Carbide rotary file Only the above package content, other products are not included. Note: Light reflection 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.