I am looking for a router bit that I don't know if it exists and if it does what it would be called so that I can find it.
Basically what I want is a flush trim bit but one where the size of the cut is of a smaller diameter than the bearing wheel.
What I am looking to do is use a pattern made of steel to cut into wood, and I need to be sure the bit won't ever reach the pattern in case I am off by a tiny bit and destroy the pattern and/or the bit.
Does such a bit exist, and if so, what would it be called?