XIANQI 1, Insert spoilboard surfacing router bit 2+2: Shank: 12.7mm1/2"; Cut Diameter: 38.1mm(1-1/2"); Carbide Inserts: above part 14*14mm, side part 12*12mm 2, This professional bottom cleaning router bit Features unique 2+2 insert knife design, that contains two cutting flutes and two up-shear scorers, which provide a smoother finish at the bottom of the cut than traditional two-knife style router bits. 3, this Planing Bit Engineered with carbide grade for the highest quality of cut, maximum cutting efficiency, and faster material removal process. Also known as a Surface Planing, Rabbeting, Flycutter, Fly Cutter, Leveler and Bed Skimming Router Bit. 4, Replaceable High Quality Blade Slab 1/2"Shank Spoilboard Surfacing Router Bit, uses solid carbide inserts, you can replace the router bit blade, rather than replacing the entire drill bit. Compared with brazed milling cutter bits and solid carbide spiral drill bits, it is a cost-effective solution. 5, 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, finishing wood using timber slab machines