Review on 🔧 Tungsten Carbide Engraving Mill by William Rothstein

I bought them for a PCB project that never materialized but found them three years later when I needed to drill out a very small screw in hardened steel. They absolutely do not tolerate abuse. I made a 0.005" pass on the auger face at high RPM and low stroke (manual milling machine). I made another one during the setup process. But the .002" passes got me where I needed to go slowly. They are SMALL, treat them with care! Don't let the workpiece move, use high speeds and make small passes.