Selected and Durable Material: We use micro-grain tungsten carbide to ensure fast, high-quality cutting and long cutter life. Besides, the hardened metal structure makes it quite durable and strong. 2. Various Sizes: The 1/4" roundover router bit set includes 4 different woodworking router bits in 3.18mm, 4.76mm, 6.35mm, 7.94mm. In this way, our router bit set is practical and adaptable. Router bit bearings. You can choose the appropriate tool according to your needs. 3. Wide Application: Roundover router bit is suitable for cutting various composition materials, such as solid wood, hardwood, softwood, MDF, particle board, plywood compact panel, and acrylic. In addition, avoid cutting non-wood materials, especially metal materials. 4. Applicable Equipment: Roundover router bits can be used in various types of routers, such as engraving machines, cutting machines, hoisting machines, CNCs, and other automatic routers. 5. Workpiece Visibility: The workpiece is visible with visibility, which means the jig can be positioned on top of the workpiece using a shank bearing bit in a hand router. Yellow color Quantity: 4 pieces