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This 1/2″ shank bit clears the surface of your Spoilboard, creating a base surface that is perpendicular to the router motor. This tool measures 2-1/2″ wide and comes with 2 carbide inserts installed plus an additional pack of 10 carbide inserts for a total of 12 that can be used on all four cutting edges, giving you a total of 24 complete blade changes! That comes out to $16.00 per blade change. Compare that to the cost of a typical carbide-tipped flattening bit that must be resharpened when dull.