Item Type: Rotary File Material: Carbon Steel Shank End Outer Diameter: Approx.25mm / 0.98in Drill Bit Diameter: Approx.40mm / 1.57in Total Length: Approx.108mm / 4.25in Application: Metalwork, tool making, engineering, model engineering, wood carving, jewellery making, welding, chamferring, casting, deburring, grinding, cylinder head porting and sculpting.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. 1 x Rotary File&nbsp