BINSTAK CNC Spoilboard Surfacing Router Bit 1 4" Shank, Slab Flattening Router Bit with 1 3 8" Cutting Diameter, 2+2 Flutes Insert Carbide Wood Delta Warm Tips: Our backwards alphabet B0CL6NVS46 Warm Tips: Our backwards alphabet silicone mold for resin can be reused for many times model number: FH 6198S Surface Planer and Bed Skimming Insert Bottom Cleaning Router Bits (Carbide) ✔ Industrial Grade ✔ These industrial router bits feature solid carbide inserts knives with four cutting edges that allow users to rotate the knife when one side becomes dull providing the highest quality finish available on woodworking tools