Premium Quality: C3 micro-grain tungsten carbide blades, solid hardened steel body with smart anti-kickback design for long lasting clean cut SizeRound edge cutter with 8 shank mm, 3.17mm/4.76mm/6.35mm/7.96mm/9.52mm/12.7mm radius. Perfect for stencil cutting and other DIY projects. Wide ApplicationThis professional round shank cutter kit is suitable for wood, MDF, particle board, plywood, acrylic and various composite materials of wood (avoid cutting metal and non-wood materials such as steel, iron and sand). Applicable equipment Use on CNC and other automatic routers as well as routers portable and desktop mounted such as bakelite milling machines, engraving machines, deburring machines, table milling machines, hanging milling machines, etc. Satisfaction NICAVKIT is committed to providing all customers high quality products and customer service. If there is any problem, contact us and our after-sales team will solve your problems as soon as possible.