Features: Ball Head Rotary File - - Sphere head with tungsten carbide teeth, 45mm shank length, 1 or 4-inch shank diameter,3cm super burr head. High Performance - - Extemely big rotary burr head with sharp tungsten carbide teeth, allowing you to easily and quickly remove a variety of materials. Saving you time and effort. Utra-long Life - - Made of heat-treated tungsten carbide, features high hardless wear-resist and durable for long time use. Suitable for machining variouskinds of metal material. Versatile - - Widely used for metalwork, tool making, engineering,model engineering, wood carving, jewellery making, welding, chamferring,casting, deburring, grinding, cylinder head porting and sculpting. Target - - This is an essential bit for metalworker andamp DIYcarving fans, easy to grasp and use, safe and reliable. Specifications: Material: 45 Steel Head Diameter: 3cm or 1.18in Shank Length: 2.5cm or 0.98in Shank Diameter: 1 or 4 in Item Weight: 99g or 3.5oz Package Weight: 100g or 3.5oz Package Size: 5.5x3x3cm or 2.17x1.18x1.18in Package List: 1 x Carbide Burr