20Pcs carbide rotary tools, double cut head, shank 1/8 inch(3mm), for electric or pneumatic tool drive, first choice for multiple machining. Features: Tungsten carbide, wear-resistant and durable, increases metal removal rate, improves ease of control, long service life. Double-cut style has rows of cutting teeth cut in two intersecting directions for quick material removal and a rougher finish. Include rotary burrs, grinding head and rotary burr cutting tools etc., meet most of your drilling needs. Machining hardness reach HRC70, for the most work, rotary burr set it can replace petiole small wheel. And their working life is 10 times longer than normal HSS burr, 200 times longer than petiole small wheel. Shank 1/8 inch(3mm), for electric or pneumatic tool drive. Speed is about 6000-50000 rev/min. Suitable for deburring and polishing cast iron, cutting, engraving carving, metal, cast steel, carbon steel, alloy steel, stainless steel, wood, stone and other materials. Specifications: Material: Tungsten Carbide Color: Silver Groove: Double Cut Solid Cutting Margin Diameter: 3mm / 0.12in(10pcs) and 6mm / 0.24in(10pcs) Shank Diameter: 3mm / 0.12in 10pcs of 3*3mm/0.12*0.12in Total Length: 40mm /1.58in 10pcs of 3*6mm/0.12*0.24in Total Length: 42~50mm / 1.65~1.97in Package Weight: 106g / 3.74ounces Package Size: 100 * 65 * 11mm / 3.94 * 2.56 * 0.43in Packing List: 20 * Carbide Rotary Tools 1 * Storage Box