TUNGSTEN CARBIDE STEEL ROTARY BUR SET: These carbide rotary burrs are made from premium Tungsten Carbide Steel, sharp, sturdy and durable. Overall length: 45-50mm, Cutting diameter 1/4'', Shank length 30mm, Shank diameter 1/8'' compatible with most rotary tools and die grinders. DOUBLE CUT DESIGN: The groove lines of the head of this carbide rotary cutter are crossed. It is used on wood, iron, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, as well as marble, jade, bone, etc. Quickly ensuring cross grooves and chips during grinding and carving. HIGH WORK EFFICIENCY: The processing efficiency is tens of times higher than the manual file tool, and almost ten times higher than the small wheel with handle. Generally, the rotary burr set can replace the small grinding wheel with handle. Easy to cut, safe and durable. LONG LIFE: Packed in a plastic case for safe storage and protection. The useful life of these heavy-duty rotary cutters is 10 times longer than high speed steel and 200 times longer than grinding wheel. The speed of rotary tools is generally 6000-50000 rpm, reducing inefficient rolling and extending the overall service life. WIDE APPLICATION: 10pcs Solid Carbide Rotary Burr Set Double Edge compatible with most small rotary tools. Great choice for DIY, crafts, hobbies, home repairs, jewelry, lapidary use, modeling, and much more.