Set of 20 double cutter head rotary cutters. Suitable for and most small rotary tools. Made of tungsten and carbide, used for rotary burrs, high hardness and high abrasion resistance. Shank Diameter: 3 mm (1/8 inch), Cutting Edge Diameter: 6 mm, Total Length: 100 mm / about 4 inches. High performance on processing copper, aluminum, alloy, iron, marble, jade, steel, glass, wood and plaster, etc. Widely used for metalwork, tool making, model engineering, wood carving, mold making, welding, chamfering, casting, deburring, grinding, etc. Shank Diameter: 3 mm (1/8 inch) Head Type: Double Cut Cutting Edge Diameter: 6 mm (1/4 inch) Shank Length: 100mm (Approx. 4 inch) Processing hardness up to above 85 Material: Steel Color: Silver Package Contents: 20 x Tungsten Carbide Rotary Burrs Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement