R3 Round Over Router Bit - Shank: 6.35mm / 1/4", Radius: 3mm, Cutting Diameter: 26mm. Round-Over edging trimming router bit is made of cemented carbide, provide superior wear resistance and high performance. Premium-quality micrograin carbide bits creats smoothly radiused edge requires little or no sanding before applying finish. Ideal woodworking cutter for processing in a variety of materials, such as softwood, MDF, particle boards, plywood, panels and other synthetic wood. Used on CNC and other automatic table-mounted portable routers as well as hand held and table mounted portable routers. Material Carbide Tipped Shank Diameter 6.35mm / 1/4" Radius 3mm Cutting Diameter 26mm Type Round Over Router Bit Brand Unbranded/Generic M.