【TUNGSTEN CARBIDE STEEL ROTARY BUR SET】: These carbide rotary burrs are made from premium Tungsten Carbide Steel, which is sharp, sturdy and durable. Overall length: 40-50mm, 1/4'' cutting diameter, 35mm shank length, 1/8'' shank diameter 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 WORKING EFFICIENCY】: The processing efficiency is tens of times higher than manual file tool, and almost ten times higher than the small wheel with handle. As a general rule, the set of rotary cutters 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