20PCS tungsten carbide burrs set is a great variety of shape. Versatile, contains everything you need for this. These die grinder bits are made of tungsten carbide steel which has long working life with high wear-resistance. 1/8 inch shank compatible with for metal grinding bits compatible with angle or straight air or electric die grinder bits.Suitable for most small rotating tools. Double cut produces a finer than single cut and reduces the size of the chips and Conditions. It also gives greater tool control and complete the project faster. The carbide burr set is ideal for fine detail work and may be used on wood, metal, plastic, ceramic, stone, glass, and other materials. Colour:silver Material:Metal Package Contents: 1 set *(20 pcs) metal engraving tools 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.