Features 1. High quality material: Made of tungsten carbide steel, sharp and durable. High efficiency, high smoothness, long service life, and high precision. 2. Different shapes: The double cut type has rows of cutting teeth that cut along two intersecting directions, which can quickly remove materials and achieve a rougher finish. Different shapes can meet your needs, easy to master and use, safe and reliable, economical and labor-saving - preservation. 3. Easy to use: 8-piece hard alloy rotary file set with a handle size of 1/4 inch, including SA, SC, SD, and SF files. Suitable for all skill levels: This is a must-have kit for woodworking and cleaning enthusiasts who frequently weld or work with metal, making it easy to master and use. 4. Scope of application: Hard alloy files are suitable for most small rotary tools and mold grinders, and can also be used in conjunction with high-speed electric grinders or pneumatic tools. 5. Widely used: widely used in metal processing, tool manufacturing, model engineering, wood carving, jewelry making, welding, chamfering, casting, deburring, grinding, cylinder head ports, and carving. Specification Material: Tungsten steel Color: Silver Size: 4.3 x 1 x 1 cm Weight: 285 g Package Include: 2 x Spherical Rotary Burr 2 x Cylinder Rotary Burr 2 x Torch Rotary Burr 2 x Cylindrical Ball Rotary Burr Have a great time shopping!