Feature:1. [Versatile] Widely used for metalwork, tool making, engineering, model engineering, wood carving, jewellery making, welding, chamferring, casting, deburring, grinding, cylinder head porting and sculpting.2. [Rotary Burr Parameter] The outer diameter of the shank end of the product is 25mm / 0.98in, the diameter of the drill bit is 40mm / 1.57in, and the total length is 108mm / 4.25in.3. [Premium Quality] The overall carbon steel material, quenching to increase the wear resistance, unique fine polishing treatment, the cutting edge is incisive and durable.4. [Easy Installation] Compact in size and light in weight, the convenient installation will largely save both your time and effort.5. [Exquisite Workmanship] Uniquely designed cutter head, round shape, smooth chip removal. A very rough coating can quickly remove the blank while maintaining a relatively smooth finish.Specification:Item Type: Rotary File Material: Carbon SteelShank End Outer Diameter: Approx.25mm / 0.98inDrill Bit Diameter: Approx.40mm / 1.57inTotal Length: Approx.108mm / 4.25inApplication: Metalwork, tool making, engineering, model engineering, wood carving, jewellery making, welding, chamferring, casting, deburring, grinding, cylinder head porting and sculpting..Package List:1 x Rotary File