1. Quality materials: This electric drilling rig accessory set is made of tungsten carbide steel, sharp and durable. High efficiency, high smoothness, long 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. 3. Easy to use: 8piece hard alloy rotary file kit with a handle size of 1/4 inch, including SA and SF files. Suitable for all skill levels: This is a musthave kit for woodworking and cleaning enthusiasts who frequently weld or work. 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 highspeed electric grinders or pneumatic tools.