Double fluted design for sharp and long lasting cutting. Suitable for softwoods, hardwoods, chipboard, plywood and etc. Use on CNC and other automatic routers as well as hand held and table mounted portable routers Used to flatten large wood slabs and level a workbench or piece of wood; runs smooth, no burning, cuts clean and fast Shank Diameter: 6.35mm / 1/4 Inch Cutting Diameter: 25.4mm / 1 Inch The blade is made of high quality tungsten steel alloy forging blade, body is made of titanium steel material(HSS) Standard: 1/4 Inch x 1 Inch