🔍 A surfacing router bit (also called a **spoilboard flattening bit** or planer bit) is a large-diameter bit used to **flatten and level surfaces**. It has cutting edges designed to shave off a thin layer across a board or slab, making the surface uniformly flat. Woodworkers use surfacing bits to level workbench tops, flatten butcher blocks, surface CNC machine spoilboards, and especially to flatten live-edge slabs that are too wide for a planer. Essentially, this bit turns your router (handheld or CNC) into a small portable planer – perfect for achieving a smooth, even surface on large or uneven wood pieces.

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