【TUNGSTEN CARBIDE STEEL ROTARY BUR SET】 : These carbide burrs are made from premium quality Tungsten Carbide Steel which is sharp, strong 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 WORK EFFICIENCY】 The processing efficiency is tens of times higher than the manual file tool, and nearly ten times higher than the small grinding 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 EXPECTANCY】 : Packed in a plastic case for safe storage and protection. The useful life of