[PREMIUM MATERIAL] Carbide rotary burr set made from high-quality tungsten steel sturdy and durable. Tungsten carbide material also makes bits more wear-resistant and heat-resistant, preventing carbide bur from too hot in the process of use. [CARBIDE DIE GRINDER BITS]Total Length:45-50mm; Shaft diameter: 1/8 inch(3mm); Drill Bit Size: 6mm and 3mm. The speed is generally 6000-30000 rpm.Too high speed may bend the shaft. Packed with plastic storage case. The working life of these solid rotary burr is 10 times longer than high-speed steel and 200 times longer than grinding wheel. [DOUBLE & SINGLE CUT]The groove lines of these 6mm head and 10pcs 3mm head carbide rotary burr's head are crossed, can prevents chipping, effectively reduce the chips clogging the grooves and make chip removal easier. which makes it more suitable for materials with relatively low density, such as wooden, plastic and aluminum. Another 10pcs 3mm head are single cut for hard material, such as iron, steel and so on. []This is an essential carbide rotary burr toolkit for woodworking and engraving enthusiasts. Various types of burrs with assorted shapes to meet your different drilling needs. Used on wood, iron, carbon steel, glass, plastic, alloy steel, stainless steel, copper, aluminum, and other metals, and marble, jade, bone etc. [ADAPTABILITY] 1/8inch shank fits most die grinders and small rotary tools with three jaw chuck for accurate centering. wide range of types and can be used for fine detail work, including cutting, engraving, grinding, polishing, trimming, burr cleaning, chamfering, grooving, reaming, hollow, beveling, rust removal, touch-up and finishing. Colour: silver Material: carbide Package Contents: 10 x Double grain rotary file 1/4 inch head 10 x Double grain rotary file 1/8 inch head 10 x Singlegrain rotary file 1/8 inch head 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.