Industrial Quality Tungsten Carbide Flush Trim Router Bits 1/2-inch cutting diameter; 2-inch flute length; 1/2-inch shank diameter Tungsten Carbide Cutters, Solid Hardened Steel(45# Steel ) Body with Anti-Kickback Design Cuts all composition materials, plywoods, hardwoods, and softwoods Use on hand held and table mounted portable routers. Suggested rotation speed: 22000-24000/Min; suggested feed speed: 35M/Min