You’ve heard of round-over router bits, but how about round-under bits? Round-under bits allow you to form the bottom edge of a bull nose without turning the material over. Combined with the matching round-over bit, you can form a full bull nose. There are two reasons you’d want to use this bit: Either the material is too heavy and/or awkward to turn over easily, or you want to form the edge with a countertop in place.
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