u/Cstorey987

I have no idea where to start when looking for the correct bit. I'm trying to use a router to expand an inner bore 54.1mm exactly 2mm. So I need to cut a precise 1mm to reach 56.1mm. Saw these cool bits that have bearings to guide you and stop you from cutting more than you want. Is there a bit that has a 1mm smaller bearing? Everything I've seen is in inches. Any help is appreciated.