【Tungsten Carbide Steel Rotary File Set】: Made of high quality tungsten carbide steel, these carbide rotary files are sharp, strong and durable, compatible with most rotary tools and grinders. /p> 【Double Cut Design】: The groove lines on the head of this carbide rotary cutter are crossed. Suitable for wood, iron, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, as well as marble, jade, bone, etc. Quickly protect transverse grooves and chips when grinding and engraving. [High Working Efficiency]: The machining efficiency is 10 times that of a manual file, and nearly 10 times that of a small whetstone with a handle. Generally, a set of rotary files can replace a small shank grinding wheel. Easy to cut, safe and durable. Long service life: packed in a plastic box for safe storage and protection. The rotation speed of the rotary tool is generally 6,000-50,000 RPM, which reduces inefficient rolling and extends the overall service life. Wide Application: 10pcs