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 or 0.98in, the diameter of the drill bit is 40mm or 1.57in, and the total length is 108mm or 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 or 0.98inDrill Bit Diameter: Approx.40mm or 1.57inTotal Length: Approx.108mm or 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