High Quality: YG6 carbide tool and #45 steel shank. Premium YG6 tungsten carbide inserts for long lasting performance Size: Cutting diameter: 12mm/16mm/19mm/22mm/25.4mm, Shank: 8mm. Wide Usage: Ideal for reeds, grooves, veins, grooves and general trims that require circular floor grooves. For cutting composites, plywood, hardwood and softwood Applicable equipment: Suitable for automatic routers such as CNC as well as portable and desktop routers. such as wood carving machines, trimming machines. Specification: Blade material: YG6 carbide. Body material: solid hardened steel no. 45 Shank Diameter: 8mm Cutting Diameter: 12mm/16mm/19mm/22mm/25.4mm. Package: 5 Basic Box Router Bits.