Features: Versatile Die Grinder Bits -- 20 different types sizes of carbide rotary file bits, oval, inverted cone, pointed cone, ball nose cone, ball nose, pointed tree nose, flame, ball, cylinder with round head and cylinder with end cut to meet your different needs. Double Cut Design -- Double groove because the lines are crossed, which makes it more suitable for materials with relatively low density, such as wooden, plastic and aluminum. Dense lines on the Tungsten Steel can make the surface of the object smoother. Premium Quality -- High quality heat-treated tungsten carbide construct rotary burr set with high quality finish provide good toughness and resistance, sharp and sturdy. Strong Compatibility -- 1/8inches(3mm) shank solid power tool carbide rotary file bit fit most small rotary tools, woodworking drilling carving engraving, making DIY carving fans much easier to do the wood working job. Wide Application -- Widely used for metalwork, tool making, engineering, model engineering, wood carving, jewellery making, welding, chamferring, casting, deburring, grinding, cylinder head porting and sculpting. Specification: Material: Tungsten Carbide Cutting Dia.: 1/4 Inch(6mm), 1/8 inch(3mm) Shank Dia.: 1/8 inch(3mm) Specifications of Carbide Burrs: Type A: Cylinder with end cut, 18mm/15mm Type C: Cylinder with round head, 18mm/15mm Type D: Ball head, 5mm/3mm Type E: Oval head, 10mm/7mm Type F: Flame head, 13mm/14mm Type G: Pointed tree, 13mm/16mm Type H: Ball nose, 13mm/10mm Type L: Ball nose cone, 14mm/16mm Type M: Pomted cone, 14mm/15mm Type N: Inverted cone, 7mm/6mm Packing List: 20 * Tungsten Steel Carbide Burrs 1 * Plastic Case