- Material and durability: This electric drilling rig accessory set is made of tungsten carbide steel, sharp and durable. It delivers high efficiency, smoothness, long service life, and high precision. - Double-cut design: The double cut type has rows of cutting teeth that cut along two intersecting directions, enabling quick material removal and a rougher finish. Different shapes are available to meet various tasks, and the set is easy to master and use. - Contents and use: 8-piece hard alloy rotary file kit with a 1/4 inch handle, including SA and SF files. Suitable for all skill levels and ideal for woodworking and cleaning enthusiasts who frequently weld or work. - Compatibility: Hard alloy files fit most small rotary tools and mold grinders, and can also be used with high-speed electric grinders or pneumatic tools. - Applications: Use for shaping, deburring, and material removal on small projects; suitable for wood, metal, and plastics workflows, weld prep and post-weld cleanup, and mold finishing tasks.