Precision Size: 8mm Shank CNC spoilboard surfacing router bit, 51mm cutting diameter, 12.7mm cutting height. Premium Material: Made of microcrystalline carbide inserts and solid hardened steel body for superior wear resistance and sharp edges, precise cutting reduces debris and burrs, and has an anti-backlash design. High-precision grinding technology, stable and efficient. Multi-Function: 4 blades allow you to quickly and cleanly cut your project material, clears the surface of your spoilboard or Creates a base surface that is perpendicular to the router motor, also suitable for trimming and slotting/grooving . Can use to flatten live edge boards too large to go through planer, great for projects of any level of complexity. Widely Applications: These router bits suitable for cutting solid wood, particle board, plywood, MDF and different wood composites. (Avoid cutting black metal and non-wood materials such as steel, iron and sand). Applicable Machines: Suitable for CNC and other automatic routers as well as hand-held and table-mounted portable routers. wood engraving machines, trimming machines, etc.