Roy, the holes are for starting pins. Usually there will be two holes, one for each side of the bit. You place your wood against the pin and slowly pivot the material until it contacts the router bit bearing or guide bushing. This prevents a sudden impact with the bit which can grab the wood and push it away which might pull your hands into the bit. Bit guards are designed to keep your hands from contacting the bit by creating a physical obstacle in the way.
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