Check the listing for details. CNC Spoilboard Surfacing Router Bit 3” Dia 1/2" Shank Cutting Tool. Condition: New. Listed at 59.53 USD. The CNC Spoilboard Surfacing Router Bit is designed to flatten, level, and clean the surface of your CNC machine's spoil board. It is used to create a level surface for the material being cut, which ensures precise and accurate cuts.The solid construction of the CNC Spoil board Surfacing Router Bit makes it highly durable and capable of withstanding heavy use in industrial woodworking applications.The detachable insert design allows for cost-effective replacement of worn or damaged cutting blades, extending the life of the bit.With its removable insert-style cutting blades, the CNC Spoil board Surfacing Router Bit offers a versatile and cost-effective solution for surfacing a variety of materials, including softwoods, hardwoods, MDF, particle board, laminates, and acrylics.