This professional "CNC Spoilboard Surfacing Router Bit" is not only perfect for wood slab flattening, resurface or plane the top surface of the spoilboard, but also for trimming and slotting/grooving. 4 flutes wood cnc router, Shank: 6.35mm 12mm 12.7mm; Cut diameter: 39mm 59mm. Suitable for woods, mdf, laminate, particle board, plywood compact panel, acrylic and etc. avoid cutting metal and non-wood materials. Use on CNC and other automatic routers as well as hand-held and table-mounted portable routers. Such as woodworking engraving machine, trimming machine, etc. Great replacement bit tool for woodworking. Specification: Material: Steel Size Chart: Dia: 38mm/1.50inch Package Includes: 1 Piece Surfacing Router Bit Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping! Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.